Tuning circuit device with built-in band pass integrated on semiconductor substrate together with PLL circuit
First Claim
1. A tuner comprisinga tuning circuit fabricated on a semiconductor substrate and including a mixer for converting a receiving signal to an intermediate frequency signal, an amplifier and a variable band pass filter connected between said mixer and said amplifier for changing a central frequency of said intermediate frequency signal and a band width for a channel, a phase locked loop including circuit components fabricated on said semiconductor substrate and supplying an oscillation signal synchronous with a reference oscillation signal to said mixer, and a controller responsive to an instruction supplied outside of said semi-conductor substrate and supplying control signals representative of said central frequency and said band width to said variable band pass filter.
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Accused Products
Abstract
An analog tuning circuit, a phase locked loop and a controller form a semiconductor integrated tuning device, and the analog tuning circuit has a variable band pass filter between a mixer and an amplifier so as to match an intermediate frequency signal to a telecasting facility standard, wherein the controller supplies control signals produced on the basis of an external instruction to the variable band pass filter so that the semiconductor integrated tuning device is shareable between the products exported to difference countries.
24 Citations
11 Claims
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1. A tuner comprising
a tuning circuit fabricated on a semiconductor substrate and including a mixer for converting a receiving signal to an intermediate frequency signal, an amplifier and a variable band pass filter connected between said mixer and said amplifier for changing a central frequency of said intermediate frequency signal and a band width for a channel, a phase locked loop including circuit components fabricated on said semiconductor substrate and supplying an oscillation signal synchronous with a reference oscillation signal to said mixer, and a controller responsive to an instruction supplied outside of said semi-conductor substrate and supplying control signals representative of said central frequency and said band width to said variable band pass filter.
Specification