Bob Widlar

Robert Swanson, chairman of Linear Technology, said in 2006:

Widlar returned to National Semiconductor for the remainder of his life. He and Dobkin never talked to each other after the breakup. Dobkin said in 2006 that "Bob was one of the few people I considered to be a genius. He was also paranoid, very hard to get along with and drank incessantly".

According to fellow analog circuit designer Bob Pease, Widlar cut down on his drinking shortly before death. Gifford said in 2002: "He stopped drinking but I think the damage was probably done, you know, in the first twenty years." According to Bo Lojek, "as he was older he was for the first time able to keep relationship with one woman."

In 2002 Electronic Design inducted Widlar in its Hall of Fame along with Alan Turing and Nikola Tesla. In 2009 Widlar was inducted in the National Inventors Hall of Fame. A sculpture dedicated to Bob Widlar and Jean Hoerni initially stood in front of the Maxim Integrated Products building in Sunnyvale, California; and was relocated in 2012 to Maxim's new headquarters in San Jose, California.

Widlar was a hard person to work with, but the few men and women who could, like Talbert and Jack Gifford, joined his inner circle for life. Widlar and Talbert closely guarded their trade secrets and kept unwanted co-workers out of the loop. Gifford, one of those accepted by Widlar and Talbert, said that Widlar "would almost talk to nobody and he would only talk to me on, you know, if I could get him in the right mood. And he was still secretive as hell". Talbert pushed Widlar's experimental orders through his plant at top speed, saving his partner four weeks on every batch at the expense of other orders. Former Fairchild photographer Richard Steinheimer said in 1995: "Talbert handling the fabrication and Widlar handling the design, they ruled the world and led the world in linear integrated circuits for a couple of decades." Fairchild executive Don Valentine said in 2004: "This was a phenomenal duo of highly eccentric – or whatever the word is beyond eccentric – individuals".

On February 27, 1991, Widlar died of a heart attack at the age of 53, in Puerto Vallarta. David Liddle said in 2009 that "the untimely early death of ... Robert Widlar is a whole story in itself". Early reports incorrectly said that Widlar died while jogging on a beach. Later sources corrected the mistake: he was running up a hill. Bob Pease wrote more precisely: "Apparently he had been jogging on a sidewalk, in a steep hilly section of Puerta Vallarta. Bob was, in recent years, pretty much into fitness, and he worked hard at his running ... I'm no doctor. But he did not die drunk, which may have amazed a number of his colleagues". Jack Gifford concurred: "He didn't die as a derelict. He wasn't, I mean he was fine. He was coherent. Probably leading the most, he was down in Mexico, living in Mexico, but he was sober and leading a reasonable life for him at that point when he died".

In 1981 Swanson, Dobkin and Widlar co-founded Linear Technology. Swanson steered the company into producing second-source parts for other companies. Three years later the relationships fell apart in a patent right dispute. Widlar claimed rights over Linear's LT1 to LT20 chips, and in May 1984 walked away, leaving the case to his lawyers. In October 1984, Swanson fired Widlar and invoked the mandatory share repurchase provision that was in Widlar's contract. According to Bo Lojek, Widlar's notebooks contained sufficient evidence to prove that many of the disputed patents were created by Widlar before Linear Technology was formed.

Some of Widlar's designs like the LM12 power amplifier and the LM10 ultra-low-voltage amplifier introduced in 1978, remain in production in the 21st century. The LM10 is capable of operating with a 1.1V power supply, thus instead of a conventional bandgap reference it employs Widlar's sub-bandgap circuit locked at 200 mV and the low-voltage Widlar output stage. For 10 years, no one else in the industry was able to produce a circuit that matched the LM10.

In November 1974 Widlar returned to National Semiconductor as a consultant.

Widlar and Talbert were instrumental in the takeover of National Semiconductor by former Fairchild Semiconductor managers Charles Sporck and Pierre Lamond in February 1967. Sporck and Lamond turned National Semiconductor into a leading producer of electronic circuits, and Fairchild Semiconductor slipped into an irreversible decline. Widlar's popularity in the industry soared: advertised as "the man who designed more than half of the world's linear circuits", he frequently gave lectures to fellow engineers, and on May 23, 1970, spoke to an audience at Madison Square Garden. Regis McKenna, former National Semiconductor executive, said in 1995 that "most of the linear devices that were probably built and marketed for the period of the sixties and seventies were based on Widlar and Talbert's technology. I mean they created, in many ways, this industry... they were the Steve Jobs and the Bill Gates, and whatever fame you want to give to anybody, they were famous people of those days. And the journals... you couldn't find a journal without their picture in it ...".

On December 21, 1970, Widlar and Talbert resigned from National Semiconductor when National Semiconductor refused to reward them adequately. Widlar cashed in his stock option for $1 million (equivalent to $6,977,721 in 2021), and retired to Puerto Vallarta, Mexico, at the age of 33. For four years he provided consultancy to the industry, but had not been formally employed anywhere for more than three years. His proud statement: "I don't work" caused him frequent troubles when crossing the Mexican border and eventually, Widlar created a set of fake business cards presenting him as a "road agent" for "Morgan Associates".

Gifford said that Widlar and Talbert were actually the founders of National Semiconductor, and that Sporck joined them later. The duo started by setting up the epitaxial process at Santa Clara. Once the technology was in place, Widlar concentrated on voltage regulators and by the end of 1966 produced the industry's first integrated linear regulator. The LM100, a revolutionary new circuit, became another flagship product that surpassed expectations for sales and longevity. In 1967 Widlar designed the LM101, an operational amplifier with improved gain, decreased input current, and protection against short circuit. The LM101 featured another unorthodox input stage, employing NPN input transistors emitter coupled to PNP transistors in a common base arrangement. The high reverse breakdown voltage of the PNP transistors allowed the LM101 to withstand a differential input voltage of ±30 V. Its frequency compensation was simpler, more robust and more stable than that of μA709. It was followed by LM101A, a functionally identical IC that pioneered the use of a field-effect transistor to control internal current sources. Widlar's solution minimized die area and current drain, and enabled operation over a wide range of power supply voltages. Later he devised another new device, the super-beta transistor. It was created in silicon by Talbert and integrated in the LM108 precision operational amplifier, which was released in 1969. These high-gain, very-low-voltage devices were capable of operating at very low input currents within the full military range of operating conditions. The items in the linear circuit product line were user friendly, very useful, and very profitable.

The μA709 was introduced in November 1965 and became Fairchild's revolutionary flagship product. For a few years, Fairchild was the leader in the field of linear ICs. Demand for its products exceeded its production capacity by a factor of ten; Fairchild's circuits were sold out for two years in advance. Gifford, one of the few men who fully understood Widlar and his work, contributed to the market boom by introducing a dual in-line package. According to Don Valentine, "at one point in time [Widlar and Talbert] were responsible – one designed them and one made them – for more than eighty percent of the linear circuits made and sold in the world". None of Fairchild's competitors came close to matching its status in the market. Fairchild patented Widlar's innovations but never licensed them and never enforced their rights in court. Competitors created clones of μA709 but only Philco succeeded in producing one that fully matched the original.

Widlar and Talbert realized that the founders of Fairchild did not intend to share their windfall profits with the designers. In November 1965 the two engineers accepted Peter Sprague's offer to join National Semiconductor's Molectro facility in Santa Clara. Widlar received an immediate stock option of 20,000 shares, each valued at five dollars then. He refused to fill an exit interview form for Fairchild and wrote only one line (exact quote): "I want to be RICH!" He told Hulme that the only thing that could keep him with Fairchild was "One million tax free by whatever way you choose". For unknown reasons, Robert Noyce, one of Fairchild's founders, continued to pay Widlar his salary until April 1966. According to Widlar, "Maybe they did not believe that I was actually leaving. Some people are really a little slow."

Widlar invented the basic building blocks of linear ICs including the Widlar current source, the Widlar bandgap voltage reference and the Widlar output stage. From 1964 to 1970, Widlar, together with David Talbert, created the first mass-produced operational amplifier ICs (μA702, μA709), some of the earliest integrated voltage regulator ICs (LM100 and LM105), the first operational amplifiers employing single capacitor frequency compensation (LM101), an improved LM101 with FET internal current control (LM101A), and super-beta transistors (LM108). Each of Widlar's circuits had "at least one feature which was far ahead of the crowd" and became a "product champion" in its class. They made his employers, Fairchild Semiconductor and National Semiconductor, the leaders in linear integrated circuits.

Widlar dispensed with hybrid technology, and used only diffused resistors formed within the silicon die. Each of the nine NPN transistors was sized and shaped according to its function, contrary to an earlier, arbitrary practice of employing standard minimal-area patterns. Widlar introduced three innovations: Interfacing a long-tail with a single-ended stage without losing half of the gain, shifting the DC level using only NPN transistors, and providing optional frequency compensation with an external capacitor. Such compensation increased the bandwidth of the device to 25-30 MHz, an unprecedented breakthrough for monolithic amplifiers at that time. Widlar did not consider the μA702 prototype good enough for production, but Fairchild decided otherwise and rushed the chip into production in October 1964. The device set the direction for the industry for decades, despite limited common-mode range, weak output drive capabilities, and a price of $300 (equivalent to $2,621 in 2021). According to Jack Gifford, the top management of Fairchild noticed the novelty and learned of Widlar's existence only after receiving enthusiastic feedback from the market.

Work at Ball Research brought Widlar in contact with Jean Hoerni and Sheldon Roberts, the creators of radiation hardened transistors and co-founders of Fairchild Semiconductor. Widlar decided to move to a semiconductor manufacturing company, and in 1963 Jerry Sanders, a Fairchild Semiconductor salesman, provided him the opportunity. According to Thomas Lee, Fairchild also wanted to have Widlar on board, and breached professional ethics by recruiting a key employee of their customer. In September 1963 Widlar was invited for an interview with Fairchild research and development (R&D) manager Heinz Ruegg. Widlar arrived at the interview intoxicated, and frankly told Ruegg what he thought about Fairchild's analog circuits: "What they are doing is bullshit". Widlar was sent to another interview with the company's Applications Engineering division, which was based in Mountain View, California. The division head, John Hulme, hired Widlar despite objections from the first round interviewers. Widlar's first assignment at Fairchild targeted IC reliability through adjustments in fabrication processes. This early work, directed by process engineer David Talbert, reduced the cost of the planar process and made possible development of monolithic (fully integrated) linear ICs. Widlar, who formally reported to John Barrett, proved himself capable of quickly improving Barrett's own designs and very soon squeezed his nominal boss out of the company.

In 1963 Fairchild's analog IC lineup, designed to military specifications, consisted of three amplifier circuits. Before Widlar, Fairchild's engineers had designed analog ICs in a style not unlike conventional circuits built with discrete devices. Despite realizing early on that this approach was impractical, owing to the severe limitations of the early planar process, they had not devised working alternatives (active loads and active current sources had yet to be invented). When the original schematic required resistor values that were too low or too high for the planar process, designers often had to resort to the use of external nichrome thin film resistors. The resulting hybrid ICs performed poorly and were prohibitively expensive. In response, Fairchild's R&D chief Gordon Moore directed the company to favor digital integrated circuits, which were simpler and also promised high production volumes. Widlar opposed this strategy and held digital electronics in low esteem: "every idiot can count to one". Talbert shared Widlar's belief and became his closest ally in the company.

In the late 1960s Widlar experimented with the band gap phenomenon and converted his basic current source block into a bandgap voltage reference. "Widlar's Leap" resulted in a robust and stable reference that was crucial for high-current, heat-intensive applications. Its low voltage, typically 1.25V, also allowed more flexibility in discrete and integrated circuit design. Widlar created another industry first by combining a power transistor and a precise voltage reference on the same die. This device, the LM109 voltage regulator, was released in 1969 and at first went unnoticed. In 1971 National Semiconductor released Widlar's LM113, the first dedicated, two-terminal voltage reference IC.

Widlar never talked about his early years and personal life. He graduated from Saint Ignatius High School in Cleveland and enrolled at the University of Colorado at Boulder. In February 1958 Widlar joined the United States Air Force. He instructed servicemen in electronic equipment and devices and authored his first book, Introduction to Semiconductor Devices (1960), a textbook that demonstrated his ability to simplify complex problems. His liberal mind was a poor match for the military environment, and in 1961 Widlar left the service. He joined the Ball Brothers Research Corporation in Boulder to develop analog and digital equipment for NASA. He simultaneously continued studies at the University of Colorado and graduated with high grades in the summer of 1963.

Robert John Widlar (pronounced wide-lar; November 30, 1937 – February 27, 1991) was an American electronics engineer and a designer of linear integrated circuits (ICs).

Widlar was born November 30, 1937 in Cleveland to parents of Czech, Irish and German ethnicity. His mother, Mary Vithous, was born in Cleveland to Czech immigrants Frank Vithous (František Vitous (or Vitouš?)) and Marie Zakova (Marie Žáková). His father, Walter J. Widlar, came from prominent German and Irish American families whose ancestors settled in Cleveland in the middle of the 19th century. A self-taught radio engineer, Walter Widlar worked for the WGAR (1220 AM) radio station and designed pioneering ultra high frequency transmitters. The world of electronics surrounded him since birth: one of his brothers became the first baby monitored by wireless radio. Guided by his father, Bob developed a strong interest in electronics in early childhood.