| 摘要 |
A switching circuit formed of a plurality of parallel channels, each channel including a control transistor, a compensating transistor and an output transistor arranged in series. The analog signals to be switched are applied each to an input terminal of a channel which is connected to the collector of the control transistor which is in turn connected to the base of the compensating transistor. A control signal is applied to a control input terminal for each channel which is connected to the base of the control transistor thereof having its emitter grounded. Thus, the application or not of a control pulse to the control terminal and then to the control transistor base determines whether an analog signal at the input terminal for the channel is applied to the base of the compensating transistor. The collector of the compensating transistor is connected to a supply voltage terminal and its emitter to the base of the output transistor having its collector connected to a supply voltage terminal and its emitter connected to an output terminal common to all channels. The control transistor is of opposite electrical polarity to the compensating transistor and functions as an emitter following circuit, delivering an output coinciding with the input to its base from the compensating transistor and thus corresponding to the analog input signal.
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