Mixing analog multiplier integrated circuit MC1496


Posted on Mar 28, 2007

Currently, high-quality communications receiver in the use of diode ring mixers and mixer by a double differential pair balanced modulator constituted, set into an analog multiplier (MC1496)


Mixing analog multiplier integrated circuit MC1496
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shown in Figure mixer circuits. LO voltage HL and the input signal voltage input from the input channel hoppers were adjusted 50kfl potentiometer, O, foot DC potentiometer zero. In addition to acting on the mixer input signal voltage and the local oscillator voltage Sapporo soul, but also the presence of interference and noise signals. Between any two of them are likely to produce the combined frequency, if the frequency of the combined signal is equal to or close to an intermediate frequency, the input signal - in time through intermediate frequency amplifier, a demodulator, the output stage produces interference, the influence of the received signal, inevitably to cause interference, in which the greatest impact is the intermediate frequency interference and interference mirror. IF signal (9MHz) removed from the single-ended output foot after Ji bandpass filter.




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