| 摘要 |
The invention concerns an arrangement including a microprocessor controller, PROM memory, and a digital to analog converter (DAC) arrangement for generating a plurality of control voltages f or trimming respective ones of a plurality of varactor controlled tunable filters. The controller couples digital control signals t o the respective DACs which generate respective analog control voltages which are applied to the respective tunable filters. A tuni ng voltage generated by a closed control loop, such as phased locked loop also under the control of the controller, is combined wit h the output control voltages generated by the respective DAC's in a resistance divider arrangement.
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