FvM -

Today, 11:29

FvM replied to a thread Varistor clamping voltage calculation for ESD in Professional Hardware and Electronics Design

Without an additional series element, a varistor between IC pin and ground will probably not increase the ESD strength much.

3 replies | 47 view(s)

Today, 11:22

FvM replied to a thread RF signal of SPDT and Bandpass filter in RF, Microwave, Antennas and Optics

It's not clear at all what's shown in the VNA measurement. How are the VNA ports connected? What's causing the high pass behavior? Nothing's been...

12 replies | 266 view(s)

Today, 11:14

FvM replied to a thread Whats wrong with my full wave bridge rectifier in RF, Microwave, Antennas and Optics

How did you determine the rectifier input impedance?

9 replies | 235 view(s)

Today, 06:58

FvM replied to a thread level shifting and amplifying signal from temp sensor with LM324 in Analog Circuit Design

You actually want a negative output offset. It can be achieved by adding a resistor from inverting OP input to a positive reference voltage, e.g. the...

4 replies | 113 view(s)

Yesterday, 15:07

FvM replied to a thread Difference of RF-Waveform between DSB-ASK and SSB-ASK in RF, Microwave, Antennas and Optics

O.K, the terms are in fact used in the Gen2 EPC specification, I forgot about it. I think there's no problem with "PR-ASK" which is just a synonym...

3 replies | 147 view(s)

23rd June 2018, 11:24

FvM replied to a thread Large signal cut off frequency of an OFA in Elementary Electronic Questions

You'll calculate slew rate for maximal frequency and output magnitude, then required OTA bias current.

3 replies | 111 view(s)

23rd June 2018, 11:09

FvM replied to a thread Whats wrong with my full wave bridge rectifier in RF, Microwave, Antennas and Optics

I_PROBE device name suggests the latter. How did you try impedance matching? Presently we see a large series inductor L1 that's probably...

9 replies | 235 view(s)

23rd June 2018, 10:59

FvM replied to a thread Eagle is being deliberately trashed in PCB Routing Schematic Layout software and Simulation

You can know who owns Autodesk, it's a market listed US corporation. The simple reason why they are implementing a subscription license model for...

10 replies | 445 view(s)

23rd June 2018, 10:06

FvM replied to a thread Large signal cut off frequency of an OFA in Elementary Electronic Questions

The usual technical term for OP is large signal cut bandwidth or sometimes "power bandwidth" rather than large signal cut off frequency. In case of...

3 replies | 111 view(s)

23rd June 2018, 09:59

FvM replied to a thread Switching power supply emission the electromagnetic waves in Power Electronics

Not necessarily. If you see FM interferences, it's more likely the computer main board, graphic card or display.

11 replies | 369 view(s)

23rd June 2018, 09:53

FvM replied to a thread Difference of RF-Waveform between DSB-ASK and SSB-ASK in RF, Microwave, Antennas and Optics

The commonly understood technical terms for the shown modulation methods are ASK and BPSK. They are e.g. used in RFID standard documents. A...

3 replies | 147 view(s)

22nd June 2018, 23:34

FvM replied to a thread Transmit data by Connect two ADSL modems over copper telephone line up to 1KM in Digital communication

The electrical safety problem is beyond the original thread topic and also not fitting the digital communication section. You better start a new...

18 replies | 1084 view(s)

22nd June 2018, 23:08

FvM replied to a thread Eagle is being deliberately trashed in PCB Routing Schematic Layout software and Simulation

Autodesk is a major CAD company but hadn't EDA products in the portfolio before acquiring Eagle. So the obvious reason why they changed the licensing...

10 replies | 445 view(s)

21st June 2018, 19:02

FvM replied to a thread OTA along with class AB output stage in Analog Circuit Design

That's what I say about the output stage. I still believe that it's essentially a drawing error because the MOS diode bias circuit makes no sense for...

18 replies | 342 view(s)

21st June 2018, 17:19

FvM replied to a thread Measured and simulated reflection coefficient s11 comparison in RF, Microwave, Antennas and Optics

Tracing it in a graphic tool?

8 replies | 207 view(s)

21st June 2018, 17:13

FvM replied to a thread RF signal of SPDT and Bandpass filter in RF, Microwave, Antennas and Optics

Filters in "RF circuits" (you didn't tell anything about your application except the frequency range) can be useful or even required for different...

12 replies | 266 view(s)

21st June 2018, 13:35

FvM replied to a thread [SOLVED] high voltage zener operation in Elementary Electronic Questions

Plus pulse absorption capability for dynamic behavior, e.g. withstanding to ESD events.

32 replies | 660 view(s)

21st June 2018, 07:43

FvM replied to a thread [SOLVED] high voltage zener operation in Elementary Electronic Questions

Zener diode voltage is linked to current by an I/V characteristic. To determine the maximum voltage that can be driven into a zener diode, you need...

32 replies | 660 view(s)

20th June 2018, 21:42

FvM replied to a thread OTA along with class AB output stage in Analog Circuit Design

It's no class AB output stage. You should place complementary common drain instead of common source output stage.

18 replies | 342 view(s)

20th June 2018, 21:29

FvM replied to a thread [SOLVED] high voltage zener operation in Elementary Electronic Questions

How is this statement related to the post #1 circuit und question? You didn't yet explain what's the problem behind this thread. What's the...

32 replies | 660 view(s)

20th June 2018, 10:58

FvM replied to a thread gyroscopes and LP filter in Analog Circuit Design

A second order Butterworth filter has -90 degree phase at the cut-off frequency (-3 dB point).

17 replies | 356 view(s)

20th June 2018, 09:42

FvM replied to a thread [SOLVED] high voltage zener operation in Elementary Electronic Questions

Makes even less sense. To get 50W power dissipation in the zener diode (about 4A zener current), you need to burn 200 kW in the current limiting...

32 replies | 660 view(s)

20th June 2018, 07:50

FvM replied to a thread gyroscopes and LP filter in Analog Circuit Design

Why "1/2 output", that's just a speculation without knowing the magnitude and phase characteristic. The relation will be different for each filter...

17 replies | 356 view(s)

20th June 2018, 07:41

FvM replied to a thread Puzzled by OPA and output noise in Analog Circuit Design

The waveform count doesn't fit, only 6 rather than 7 images attached. What's connected in place of VG2, a ground short? Are the OPA344 and...

7 replies | 216 view(s)

20th June 2018, 07:11

FvM replied to a thread [SOLVED] high voltage zener operation in Elementary Electronic Questions

A brief view on the zener diode I/V characteristic clarifies that this can't ever happen (at least not without blasting the zener diode chip before)....

32 replies | 660 view(s)

20th June 2018, 06:39

FvM replied to a thread How Carrier and Code NCO generates new frequency and phase? in PLD, SPLD, GAL, CPLD, FPGA Design

What do you mean with decimal representation in this regard? What's the range of the loop filter output? - - - Updated - - - The "mathematical...

4 replies | 162 view(s)

20th June 2018, 06:30

FvM replied to a thread Verilog code for BCD to Floating point representation in PLD, SPLD, GAL, CPLD, FPGA Design

A Verilog implementation of double dabble algorithm can be e.g. found here (didn't check the code)...

32 replies | 760 view(s)