Roff said:
That's true, but the circuit will actually work in hardware. Like many things, the devil is in the details. I suspect you know all of this, but I'll say it anyway for the benefit of others.
The trick is to build it so you don't add unwanted components (inductors, capacitors) to the circuit. As you said, Veroboard is not the way to do it, but I have breadboard material that consists of a 0.1" grid of plated-through holes, with ground plane surrounding them on one side, and I'm sure you could successfully build it on that. I couldn't test it, because I don't have a 6GHz generator.
Not to mention that it really doesn't interest me.
thank you roff!!!
I tested the circuit and it work very well also in the reality.
now i have an other problem, i tried to used an amplifier and an ADC but the circuit works very well when i use 1 volt input signal but the i put a 0.1 volt signal the input of the amplifier became negative(it's v(4) in the picture below)
if you can, help me please.
i post the cir file and the simulation output of the 1 volt input signal and 0.1 volt input signal
biased detector.cir
*Esempio di curva I-V
.probe
.model BAT62/SIE D(IS=120N RS=200 N=1.04 XTI=1.8 EG=.68
+ CJO=.35P M=.14 VJ=.4 FC=.5 BV=40 IBV=5U TT=25P)
.inc ./AD8009.cir
.inc ./AD8611.cir
*EXP( {v1} {v2} {trise_delay} {tau_rise} {tfall_delay} {tau_fall) )
*Vname 12 0 PULSE(0V 0.01V 0S 0.5nS 0.5nS 100nS 200nS)
*V1 - initial voltage; V2 - peak voltage; TD - initial delay time; Tr - rise time; Tf - fall time; pwf - pulse-wise; and Period - period.
Vname 12 0 EXP(0V 0.1V 0S 0.5nS 0S 40nS)
Vd 13 0 sin(0 1V 4GHz)
****** INGRESSO **********
Epulse 1 0 VALUE = {V(12)*v(13)}
*V1 1 0 SIN(0 0.7 6G)
********** CAPACITA **********
* SEPARA LA POLARIZZAZIONE *
* DAL SEGNALE APLLICATO IN *
* INGRESSO. *
******************************
C1 1 2 1000pF
********** RF CHOKE ***********
* SEPARA L'ALIMENTAZIONE A RF *
* DA QUELLA IN DC *
*******************************
L1 2 5 33nH
C4 5 0 10nF
R1 5 6 50kOhm
V2 6 0 1V
********** DETECTOR **********
D1 2 3 BAT62/SIE
********** FILTRO PASSABASSO**********
* - LA RESISTENZA FISSA LA BANDA *
* - LA CAPACITà TIENE LA CARICA *
**************************************
C2 3 0 10pF
R2 3 0 500Ohm
R_LPF 3 4 1kOhm
C_LPF 4 0 10pF
******** AMPLIFICATORE AD8009 ********
R21 27 0 10
R20 28 27 1000
R25 28 0 100
Xamp 4 27 100 0 28 AD8009an
VCC 100 0 5V
******** ADC D8611 ******
Xcomp 28 99 100 0 0 0 7 8 ad8611
Rout 7 0 50
Rx 98 99 1k
Vcomp 99 0 1.8V
.TRAN 0 1uS
.PLOT TRAN V(1)
.end