Nothing could be simpler, an antenna, a coil and a 1N4148 diode but I'm seeing some schematics that have 2 diodes with one replacing the coil and...

Nothing could be simpler, an antenna, a coil and a 1N4148 diode but I'm seeing some schematics that have 2 diodes with one replacing the coil and the cathode connecting to the antenna. Now that I'm old and stupid can someone tell me what that diode is doing please? Thanks.

The late lamanted ATF-50189 phemt made an amazing diode. 1 amp and about 3 pF. I tried a MiniCircuits SAV-541 as a...

The late lamanted ATF-50189 phemt made an amazing diode. 1 amp and about 3 pF. I tried a MiniCircuits SAV-541 as a diode. https://www.dropbox.com/sh/0cgvrabjdichvu4/AAAGRgxUuWOEn0ULKFgjQK8da?dl=0 Cd is only about half a pF and Vf about 0.2. What's weird is that it's very noisy in the negative-drain "forward" conduction direction. It's the same at 20 MHz scope bandwidth, so it's not s...

Could some electronics guru here pleae help ? I want to simulate a double balanced diode mixer with a LO frequency of 50 MHz and RF frequency...

Could some electronics guru here pleae help ? I want to simulate a double balanced diode mixer with a LO frequency of 50 MHz and RF frequency of 100 MHz. Both LO and RF signal generators have a source resistance of 50.0 Ohms. The simplest Schottky diode model has a fixed resistance Rs, in series with a praallel Cj/Rj pair(junction capacitance/resistance). While Schottky diode SPICE mo...

With a more appropriate op amp and better choice of operating point for the diode it looks like the lambda diode load really does provide a...

With a more appropriate op amp and better choice of operating point for the diode it looks like the lambda diode load really does provide a significant bandwidth improvement as compared to a resistive load for the gyrator in the high-pass configuration, about 4x, here: While preserving the low-frequency response

I want to make a simple rectifier for an RF signal, frequency less than 10 MHz. The schematic below (view with fixed font) is from an...

I want to make a simple rectifier for an RF signal, frequency less than 10 MHz. The schematic below (view with fixed font) is from an article describing a circuit useable with much higher frequencies and used a hot-carrier diode (1N5711). For relative low frequencies would a general purpose diode such as a 1N4148 be adequate? If a hot-carrier would be necessary I have a problem because I do...

Hi; I've been using N channel Jfets connected as diodes for input protection for a long time. Everything seems to just work. Recently an...

Hi; I've been using N channel Jfets connected as diodes for input protection for a long time. Everything seems to just work. Recently an application came up where the low leakage of a diode connected FET would be useful but when forward biased it could pass tens to a few hundred mA. Does anyone know what characteristic of a JFET would define the max current through the Diode connec

Folks, After John Larkin sent me SMS7621 Schottky RF diodes I played around with them in the lab. While they perform nicely at room...

Folks, After John Larkin sent me SMS7621 Schottky RF diodes I played around with them in the lab. While they perform nicely at room temperature everything goes to pots at a slightly elevated temperature. At ballpark 50C the leakage current is already painfully high for use as a sampler diode. Question: Is there a fast RF diode or sampling diode in a reasonable cost range (low single-dig...

I need a low current, low voltage and extremely low leakage diode. The gate junction of MMBFJ202 seems extremely well-suited for the job. The...

I need a low current, low voltage and extremely low leakage diode. The gate junction of MMBFJ202 seems extremely well-suited for the job. The datasheet says its absolute maximum gate current is 50mA. Can I operate it reliably at 20mA for years? I mean, would there be any relevant degradation mechanism or is this junction an ordinary diode and I shouldn't worry about it? Best regards, Pio...

Can anyone recommend a PIN diode that can be used for up to switching a RF amplifier in and out of the transmission line at 150 MHz and 450...

Can anyone recommend a PIN diode that can be used for up to switching a RF amplifier in and out of the transmission line at 150 MHz and 450 MHz. The powewr level ia 50 watts RF.

So we modulate the light from a diode laser by wiggling the diode current. This has two effects, the most obvious is that it changes the...

So we modulate the light from a diode laser by wiggling the diode current. This has two effects, the most obvious is that it changes the amplitude of the light. (AM) Less obvious (though I think more dominant in changing the frequency.) is that changing the laser current has two other effects on the frequency. At low frequencies (

Hi Guys, I have three Diode Detectors built as the Figure 4 schematic in this article, using different number diodes. >...

Hi Guys, I have three Diode Detectors built as the Figure 4 schematic in this article, using different number diodes. > https://www.rf-microwave.com/uploads/diodes/a_temperature_compensated_linear_diode_detector.pdf I used Bat62, 1n5711 and some unknown germanium diodes I pulled of of some old pcbs. The best is the unknown germainums, which are probably 1N34A diodes. I have som

Is there a Spice model of a photo diode that delivers current ( laser_power, Vbias ...) ?? I'm not yet bound to a certain...

Is there a Spice model of a photo diode that delivers current ( laser_power, Vbias ...) ?? I'm not yet bound to a certain type. Application is low frequency, but very low noise. And Phil, some of your papers were a tremendous help! Cheers, Gerhard

This is the model I'm using: .model LXHL-BW02 D(Is=4.5e-20 Rs=.85 N=2.6 Cjo=1.18n Xti=200 Iave=400mA Vpk=5 mfg=Lumileds type=LED) It is...

This is the model I'm using: .model LXHL-BW02 D(Is=4.5e-20 Rs=.85 N=2.6 Cjo=1.18n Xti=200 Iave=400mA Vpk=5 mfg=Lumileds type=LED) It is the closest selection of Vf to the diode I'm going to use. However it is a bit higher than the spec sheet. How do I adjust the parameters above to get a lower Vf? Thanks, Guys. JohnS

I'm looking for a replacement for the CA3039 diode array, which has been successfully used in a precision demodulator circuit operating up to 1...

I'm looking for a replacement for the CA3039 diode array, which has been successfully used in a precision demodulator circuit operating up to 1 MHz. The part has been obsoleted by Intersil. The important characteristics are low leakage current (less than 0.1 nA at 25C with 1 V reverse bias) and close matching of forward voltage drops. Also, the forward voltage drop with 1 nA or le

When I place an SMD diode in my pcb art top layer, (SOD123) and it's rotated 90 degrees -- is the anode on the right or left? (and obviously...

When I place an SMD diode in my pcb art top layer, (SOD123) and it's rotated 90 degrees -- is the anode on the right or left? (and obviously the opposite for 270). I'm asking because I still don't get the silkscreen layer symbol for the part but maybe there is a standard based on rotation and the screen symbol doesn't matter? Like even if I had a generic 1206 or something there, they would...

As part of an experiment with solar, I want to drive my 220V 3kW immersion heater with a suitable diode so that the effective power is ~1.5kW...

As part of an experiment with solar, I want to drive my 220V 3kW immersion heater with a suitable diode so that the effective power is ~1.5kW and can be driven by a smart switch so that it doesn't suck too much out of the 9.5kWh battery or solar panels.. What diode? This is UK spec. -- This email has been checked for viruses by Avast antivirus software. www.avast.com

I want lots of voltage drop at 100 mA or so. A high voltage fast-recovery diode, like ES1G, might work. I suppose I could just put two...

I want lots of voltage drop at 100 mA or so. A high voltage fast-recovery diode, like ES1G, might work. I suppose I could just put two ES1Gs in series, but that's not sporting. MMBD5004S is two wimpy diodes in series, in SOT-23. That would drop about 2 volts at 100 mA! This is a supply sequencing dilemma with the LT6803. A long story.

If I have to put ESD diode and current limiting series resistor to protect the IO pin of MCU from ESD and over current, which is the suggested...

If I have to put ESD diode and current limiting series resistor to protect the IO pin of MCU from ESD and over current, which is the suggested way? MCU Pin -------------- Series R -- TVS to GND -- Connector or MCU Pin -------------- TVS to GND -- Series R-- Connector With the 2nd option, doesn't the R limit the surge into TVS needing only lower wattage ESD diode compared to 1st option?...

I brought and use them as 12V 5W zeners in 32S4P 400V 1A. When balanced, each 1N5439 draws around 400/128 = 3.1W. Occasionally, i got smoke...

I brought and use them as 12V 5W zeners in 32S4P 400V 1A. When balanced, each 1N5439 draws around 400/128 = 3.1W. Occasionally, i got smoke signals with them. No big deal when close to home, but headache trouble shooting on the road. Is there a better part I can use? Some manufacturers list it as "Varactor Diode". https://www.alldatasheet.com/view.jsp?Searchword=1N5439

https://www.microsemi.com/document-portal/doc_view/134814-micronote-701-pin-diode-fundamentals Of course, given that this is an RF appnote,...

https://www.microsemi.com/document-portal/doc_view/134814-micronote-701-pin-diode-fundamentals Of course, given that this is an RF appnote, it's wrong. Interesting pattern: clumsy font changes are flags for errors. -- Father Brown's figure remained quite dark and still; but in that instant he had lost his head. His head was always most valuable when he had lost it. ...