Receiver digital-analog converter and tuning circuit

Details Receiver digital-analog converter and tuning circuit Receiver digital-analog converter and tuning circuit

2007-10-23

2007-10-23

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S173100, C455S178100, C455S182100, C455S182300, C455S191100, C455S192100, C455S193100, C455S193200

Reexamination Certificate

active

10533359

ABSTRACT:
An object of the present invention is to provide a receiver, a digital-analog converter and a tuning circuit in which temperature compensating components can be formed on a semiconductor substrate while reducing component costs. An FM receiver100is constituted by including an antenna1, a high frequency receiving circuit2, a local oscillator3, two digital-analog converters (DACs)4, 6, a control section8, a mixing circuit9, an intermediate frequency amplification circuit10, a detection circuit11, a low frequency amplification circuit12and the speaker13. The DACs4, 6have a predetermined temperature coefficient, of which output voltage is changed in accordance with ambient temperature. When a characteristic of VCO31is changed with variations of ambient temperature so as to cause a control voltage applied to the VCO31to be changed, output voltages of the DACs4, 6are also changed similarly.

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