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Frequency modulation circuit

阅读:190发布:2023-04-04

专利汇可以提供Frequency modulation circuit专利检索,专利查询,专利分析的服务。并且A first operational amplifier, used as an active filter tuned to a predetermined carrier frequency, is connected in a loop circuit with a second operational amplifier, used as a saturable amplifier. A square wave is generated by the saturable amplifier and is passed by the filter to develop a sine wave at the filter output. This sine wave carrier is modulated in frequency by a modulating signal applied to the gate of a field-effecttransistor which is connected across the input of the filter.,下面是Frequency modulation circuit专利的具体信息内容。

1. A frequency modulation circuit comprising: differential amplifier means having first and second inputs and an output, a filter having an input and an output, said output being connected to the first input of the amplifier means and said filter being tuned to a predetermined carrier frequency, resistor means connected to the input of the filter for manually tuning the frequency of the filter, feedback loop means connecting the output of the amplifier means to the input of the filter and including a voltage divider, a modulation input, a modulationvoltage-responsive continuously variable impedance connected to the modulation input, the second input of said amplifier means, and the input of said said filter to vary the tuning thereof, and frequency-modulated-wave output connections coupled to the filter output.
2. Circuit according to claim 1, wherein said amplifier means is a solid-state operational amplifier.
3. Circuit of claim 1, wherein said filter is an active filter.
4. Circuit of claim 1, wherein said filter comprises a solid-state operational amplifier.
5. Circuit according to claim 1, wherein said continuously variable impedance comprises a field-effect-transistor having two current-carrying electrodes and a control electrode, wherein one of said current-carrying electrodes is connected to the input of said filter.
6. Circuit of claim 1, wherein the amplifier means comprises a solid-state operational amplifier operating as a saturable amplifier, and wherein said filter comprises a solid-state operational amplifier.
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