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- From: whit@carson.u.washington.edu (John Whitmore)
- Newsgroups: sci.electronics
- Subject: Re: Whatever happened to tunnel diodes ?
- Message-ID: <1992Nov18.223549.3341@u.washington.edu>
- Date: 18 Nov 92 22:35:49 GMT
- Article-I.D.: u.1992Nov18.223549.3341
- References: <3sL6TB1w165w@inqmind.bison.mb.ca>
- Sender: news@u.washington.edu (USENET News System)
- Organization: University of Washington, Seattle
- Lines: 32
-
- In article <3sL6TB1w165w@inqmind.bison.mb.ca> bills@inqmind.bison.mb.ca (Bill Shymanski) writes:
- >I have an old General Electric "Transistor Manual - 7th Edition", which
- >looks like it was published in 1964 or so. They have quite a few
- >illustrations of the use of tunnel diodes. Whatever happened to the
- >tunnel (Esaki) diode ?
-
- Tunnel diodes can amplify, mix, and oscillate. They operate
- at sub-1V power supply levels, and at moderate (1 mA) currents.
- Unfortunately, they are two-terminal devices (so they don't separate
- the output signal from the input), and operate at such high frequencies
- (2 GHz is typical) that UHF design rules should be used to ensure
- acceptable results.
-
- Until relatively recently, every UHF TV tuner had a tunnel
- diode local oscillator. Silicon and GaAs FETs have taken over
- from Ge (germanium, not General Electric) tunnel diodes.
-
- EEM lists several sources for tunnel diodes/back diodes.
-
- American Microsemiconductor (201) 377-9566
- Diotec Electronics Corp. (310) 767-1052
- FEI Microwave (408) 732-0880
- Germanium Power Devices (508) 475-5982
- Microphase (203) 866-8000
- Relay Specialties (201) 337-1000
- Solid State Devices (714) 670-7734
-
- Of these, I think American Microsemiconductor is a
- stockpiler of old parts, and Germanium Power Devices actually
- manufacturers obsolete designs to order.
-
- John Whitmore
-