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Circuit 1: Simple Differential Pair

The following file determines the dc operating point of a simple differential pair. In addition, the ac small-signal response is computed over the frequency range 1Hz to 100MHz.

    Simple differential pair.
    vcc 7 0 12
    vee 8 0 -12
    vin 1 0 ac 1
    rs1 1 2 1k
    rs2 6 0 1k
    q1 3 2 4 mod1
    q2 5 6 4 mod1
    rc1 7 3 10k
    rc2 7 5 10k
    re 4 8 10k
    .model mod1 npn bf=50 vaf=50 is=1.E-12 rb=100 cjc=.5pf tf=.6ns
    .ac dec 10 1 100meg
    .end



Stephen R. Whiteley 2017-03-28