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Problem with Waveform displaying DB() and PH() for signals of below -100dB

3 years ago 412
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Description

Problem with Waveform displaying DB() and PH() for signals of below -100dB.

Using a volProbe in an AC analysis, signals attenuated by more than 100dB displayed in Waveform, wrap around and are stuck at 0dB.

The phase response as DB(V(OUT))) approaches and then passes -100dB is also wrong because, in this example it should continue to asymptotically approach -90 degrees.

Please compare this with:

http://www.ngspice.com/index.php?public_circuit=qiAlMw

Note that:

20*log10(MAG(V(OUT))) ; this plots OK but Y axis is not labelled in dB

PH(v(out))360/(2pi) ; this plots OK but Y axis is labelled in V

Run the simulation and then using the blue gear icon in the WaveForm display: place the DB(V(OUT)) and PH(V(OUT)) traces in Pane 2.

Documents

Problem with Waveform displaying DB() and PH() for signals of below -100dB

Low Pass plotting problem

BOM

ID Name Designator Footprint Quantity
1 100k R1,R3,R4,R5 R3 4
2 2.2k R2 R3 1
3 0.22u C1 C1 1
4 1Meg R6,R12,R11,R13 R3 4
5 0.02u C2 C1 1
6 0.1u C3 C1 1
7 300 R7 R3 1
8 2Meg R8,R9 R3 2
9 50k R10 R3 1
10 1N4001 D1 DO35-7 1
11 1u C4 C1 1
12 5.5n C5 C1 1
13 0.039u C6 C1 1
14 200V V1 2P-5.0 1
15 ECC83_DM U1,U2 NONE 2
16 SIN(0 1 50) AC 1 0 V2 2P-5.0 1

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