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bfr540 spice
dear all,
I designed a power amplifier with frequency = 433MHz,and power = 50mW.
used a BJT of BFR540, but in the datasheet only the S-perameter working at A-class.
How can I get the S-perameter working at C-class?
thanks!
how to measure complex impedance
can not measure the impedance use a VNA.
because, the method of the VNA is:output a signal,and then measure the reflectiong of the load
2-bit adc
GPS Frontend's amplifier is a AGC amplifier.so the 2bits ADC always have 2 bits valid data.
GPS is a Spread Spectrum system. it do not need high precision
2sc3356 model
I'll design a FM LNA(fom 76MHz - 108MHz),use 2sc3356
there are only s-parameter of the 2sc3356 form 200Mhz-2Ghz in the datasheet of 2sc3356.
convert citifile to touchstone
1.get the complex impedance of ZL,by the equation of S11 = (ZL - Z0)/(ZL + Z0);
2. calculate the S11 with other Z0 (eg. 100ohm) by the equation of S11 = (ZL - Z0)/(ZL + Z0) too.
it's easy to be calculated by matlab's complex operation
can get the vector voltage of V1,V2, the impedence of netword be measured ZL = v2/(v1/1).
S11 = (ZL-Z0)/(ZL + Z0)
must calibrate befor use. connect in a resistor which is not 50 ohm. can get the length of the Transmission Line between the source and ZL
it have something wrong? please gave me...
fm modulator with avr
the transistor after the antenna is neither a Mixer nor an IF amp, it is a RF amp. the RF not be mixed and be demodulated direct.
the 2 opAmps be used to turn the small analog signal to digital signal
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