US 2007/0021083 A1 · SEMICONDUCTOR DEVICE FOR A TUNER AND DIVERSITY RECEIVER

Abstract

A semiconductor device for a tuner generates a local oscillation signal inside or selects a local oscillation signal introduced from the outside, and controls the power consumption of the circuit used for generating the local oscillation signal. The diversity receiver constituted using the semiconductor device has semiconductor device 1 selected to generate a local oscillation signal inside and semiconductor device 2 selected to introduce a local oscillation signal from the outside. The local oscillation signal of the semiconductor device 2 is driven by the local oscillation signal of the semiconductor device 1. Consequently, any unnecessary power consumption of the circuit generating the local oscillation signal of semiconductor device 2 can be reduced. In addition, since they are the same type of semiconductor device, the uniformity of the operating characteristics of the diversity receiver can be improved.

Claims20

Dependent claims

A semiconductor device for a tuner comprising

(a) a mixer that converts the frequency of the received signal using a local oscillation signal;
(b) a means that generates the local oscillation signal in the semiconductor device for a tuner;
(c) a means that introduces the local oscillation signal from outside of the semiconductor device for a tuner;
and
(d) a power control means that reduces the power consumption of the semiconductor device for a tuner when the local oscillation signal is introduced from outside of the semiconductor device for a tuner.

2 more elements

A semiconductor device for a tuner comprising:

(a) a voltage-controlled oscillator circuit that generates a first local oscillation signal;
(b) a phase-locked loop circuit that generates a voltage control signal for controlling the oscillation of the voltage-controlled oscillator circuit;
(c) a power control means that controls the power consumption of the voltage-controlled oscillator circuit and/or the phase-locked loop circuit;
(d) a local oscillation signal input terminal to which a second local oscillation signal is input;
(e) a local oscillation signal selecting means that selects the first or second local oscillation signal as the local oscillation signal;
and
(f) a mixer that converts the frequency of the received signal using the local oscillation signal.

4 more elements

A semiconductor device for a tuner comprising;

(a) a selection signal terminal to which a selection signal is input;
(b) an oscillation signal terminal to which an oscillation signal is input;
(c) a voltage-controlled oscillator circuit that oscillates as a function of the oscillation signal to generate a local oscillation signal when the selection signal is in a first state and stops oscillating and bypasses the oscillation signal as the local oscillation signal when the selection signal is in a second state;
(d) a phase-locked loop circuit that generates a voltage control signal for controlling the oscillation of the voltage-controlled oscillator circuit when the selection signal is in the first state and stops the generation of the voltage control signals when the selection signal is in the second state;
(e) a power control means that controls the power consumption of one of the voltage-controlled oscillator circuit and the phase-locked loop circuit as a function of the state of the selection signal;
and
(f) a mixer that converts the frequency of the received signal using the local oscillation signal output from the voltage-controlled oscillator circuit.

4 more elements

Dependencies are inferred from the claim text.

Semiconductor device for a tuner and diversity receiver

Life of this patent

Semiconductor device for a tuner and diversity receiver

Life of this patent

Abstract

Claims20