Semiconductor integrated circuit for radio communication

• US 20050107116A1
• Filed: 10/28/2004
• Published: 05/19/2005
• Est. Priority Date: 11/14/2003
• Status: Active Grant

• Current Assignee: Pannova Semic, LLC (Vector Capital Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Yamaguchi, Satoshi
• Granted Patent: US 7,187,954 B2
• Time in Patent Office: Days
• US Class Current: 455/552.100
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 1/44 Transmit/receive switching

Abstract

A semiconductor integrated circuit for radio communication includes a receiving-system high frequency block including a group of circuits for processing a received high frequency signal, a receiving-system voice band block including a group of circuits for processing a received voice band signal, a transmitting-system voice band block including a group of circuits for processing a transmission voice band signal, a transmitting-system high frequency block including a group of circuits for processing a transmission high frequency signal, and a power source control circuit for performing power source control to operate/stop each of the groups of circuits based on a power source control signal. The power source control circuit performs individual power source control for at least one circuit of the multiplier, the noise detector, the voice signal power amplifier, and the voice signal level detector, and also performs the power source control for each of the receiving-system high frequency block, the receiving-system voice band block, the transmitting-system voice band block, and the transmitting-system high frequency block, except for the at least one circuit subjected to the individual power source control. Current consumption is reduced depending on the operating state and a deterioration of the rising characteristics of power source is suppressed.

Claims

1. A semiconductor integrated circuit for radio communication comprising:

a receiving-system high frequency block including a group of circuits for processing a received high frequency signal;

a receiving-system voice band block including a group of circuits for processing a received voice band signal;

a transmitting-system voice band block including a group of circuits for processing a transmission voice band signal;

a transmitting-system high frequency block including a group of circuits for processing a transmission high frequency signal; and

a power source control circuit for performing power source control to operate/stop each of the groups of circuits based on a power source control signal,

wherein the receiving-system high frequency block includes a local oscillator for outputting a local frequency signal, a multiplier for receiving an output of the local oscillator and the received signal as inputs and outputting an intermediate frequency signal, an intermediate frequency bandpass filter for separating an intermediate frequency signal from an output of the multiplier, an intermediate frequency amplifier for amplifying an intermediate frequency signal output from the intermediate frequency bandpass filter, an intermediate frequency detector for detecting a level of an intermediate frequency output from the intermediate frequency amplifier, a demodulator for demodulating a signal output from the intermediate frequency amplifier, and a noise detector for detecting a level of demodulation noise in a signal output from the demodulator,

the receiving-system voice band block includes a received voice signal amplifier for amplifying a demodulation output of the demodulator, a received voice signal bandpass filter for separating a received voice signal from an output of the received voice signal amplifier, and a voice signal power amplifier for driving a loudspeaker based on an output of the received voice signal bandpass filter and an output of a data signal amplifier included in the group of circuits for processing the transmission voice band signal,

the transmitting-system voice band block includes the data signal amplifier for amplifying a data signal, a data signal lowpass filter for separating a data signal from an output of the data signal amplifier, a transmission voice signal amplifier for amplifying a transmission voice signal, a transmission voice signal bandpass filter for separating a transmission voice signal from an output of the transmission voice signal amplifier; and

a voice signal level detector for detecting a level of a transmission voice signal based on an output of the transmission voice signal amplifier, and

the transmitting-system high frequency block includes a modulator for receiving and modulating an output of the data signal lowpass filter and an output of the transmission voice signal bandpass filter, and a transmission signal generator for outputting a transmission signal based on an output of the modulator, and

wherein the power source control circuit performs individual power source control for at least one circuit of the multiplier, the noise detector, the voice signal power amplifier, and the voice signal level detector, and performs the power source control for each of the receiving-system high frequency block, the receiving-system voice band block, the transmitting-system voice band block, and the transmitting-system high frequency block, except for the at least one circuit subjected to the individual power source control.

2. The semiconductor integrated circuit for radio communication according to claim 1, wherein

the power source control circuit performs individual power source control for each of the multiplier, the noise detector, the voice signal power amplifier, and the voice signal level detector, and performs the power source control for each of the receiving-system high frequency block except for the multiplier and the noise detector, the receiving-system voice band block except for the voice signal power amplifier, the transmitting-system voice band block except for the voice signal level detector, and the transmitting-system high frequency block.

3. The semiconductor integrated circuit for radio communication according to claim 1, wherein

the power source control circuit performs individual power source control for the voice signal power amplifier, and performs the power source control for each of the receiving-system high frequency block, the receiving-system voice band block except for the voice signal power amplifier, the transmitting-system voice band block, and the transmitting-system high frequency block.

4. The semiconductor integrated circuit for radio communication according to claim 1, wherein

the power source control circuit performs individual power source control for the voice signal level detector, and performs the power source control for each of the receiving-system high frequency block, the receiving-system voice band block, the transmitting-system voice band block except for the voice signal level detector, and the transmitting-system high frequency block.

5. The semiconductor integrated circuit for radio communication according to claim 1, wherein

the power source control circuit performs individual power source control for the noise detector, and performs the power source control for each of the receiving-system high frequency block except for the noise detector, the receiving-system voice band block, the transmitting-system voice band block, and the transmitting-system high frequency block.

6. The semiconductor integrated circuit for radio communication according to claim 1, wherein

the power source control circuit performs individual power source control for the multiplier, and performs the power source control for each of the receiving-system high frequency block except for the multiplier, the receiving-system voice band block, the transmitting-system voice band block, and the transmitting-system high frequency block.