Serial radio frequency to baseband interface with power control

• US 8,903,348 B2
• Filed: 07/30/2003
• Issued: 12/02/2014
• Est. Priority Date: 02/19/2003
• Status: Active Grant

• Current Assignee: CSR Technology Incorporated (Qualcomm, Inc.)
• Original Assignee: CSR Technology Incorporated (Qualcomm, Inc.)
• Inventors: Gronemeyer, Steve, Tso, Robert
• Primary Examiner(s): Nguyen, Duc M
• Application Number:
  US10/632,051
• Publication Number:
  US 20040166822A1
• Time in Patent Office: 4,143 Days
• Field of Search: 455/574, 4553431-3435, 342/357.06, 370/359, 370/366
• US Class Current: 455/343.1
• CPC Class Codes: G01S 19/34 Power consumption
• CPC Class Codes: H04B 1/16 Circuits
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 52/028 switching on or off only a part of the equipment circuit blocks
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

An interface between an RF processing section and a baseband processing section supports general purpose message transmission as well as satellite positioning system signal sample transmission between the RF processing section and the baseband processing section. The interface includes a bi-directional message interface and a data interface. The message interface supports transmission of power control messages to the RF processing section to provide detailed control over activation or de-activation of individual blocks of hardware circuitry in the RF processing section.

Claims

1. An RF front end for a satellite positioning system receiver, the front end comprising:

an RF processing section comprising an RF input for receiving satellite positioning system signals;

an RF to baseband interface coupled to the RF processing section, the interface comprising;

a bi-directional message interface for communicating messages between the RF processing section and a baseband processing section, including receiving a power control message from the baseband processing section wherein the power control message is associated with power consumption of the RF processing section, wherein the RF section includes a register for receiving the power control message from the baseband section and wherein devices to be controlled by the power control message are coupled to the register to receive respective power control data from the received power control message;

a data interface for communicating data from the RF processing section to the baseband processing section;

wherein the message interface comprises;

a message clock line;

a message-in signal line and

a message-out signal line; and

wherein the message-out signal line carries an output bit stream representing the power control message, the data interface comprises a data clock signal line and a data bit signal line; and

the data clock signal line carries a data clock comprising a rising edge and a falling edge;

the data bit signal line carries a data signal comprising a sign bit and a magnitude bit; and

the first data bit is valid on the rising edge of the data clock and the second data bit is valid on the falling edge of the data clock.