| 摘要 |
<p>A switching circuit comprising at least two amplifiers having separate inputs, for receiving input signals, and a common output. A selecting circuit for selecting which of the input signals is amplified and applied to the output includes a switchable biasing means for biasing one amplifier ON and the other amplifier OFF. The amplifiers inputs are inverting inputs and each amplifier has a low output impedance and a feedback network present between the inverting input and the common output whereby the feedback network of the OFF amplifier does not effect the ON amplifier.</p> |
