Sliding if transceiver architecture

Patent metadata

Field	Value
Publication number	US-8995505-B2
Application number	US-201213691238-A
Country	US
Kind code	B2
Filing date	Nov 30, 2012
Priority date	Nov 30, 2012
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

Techniques for providing a transceiver with a sliding intermediate frequency (IF). In an aspect, a PLL generates a single local oscillator (LO) signal used for both up-conversion by a transmit (TX) signal path and down-conversion by a receive (RX) signal path, wherein the LO frequency is chosen as the TX carrier frequency. As the TX and RX carrier frequencies may generally differ by a variable amount, the RX signal path utilizing the (TX) LO frequency for down-conversion may be characterized as having a “sliding” IF. To accommodate the sliding IF receiver architecture, specific processing functions such as charge sampling, discrete-time analog band-pass filtering, and sub-sampling analog-to-digital conversion (ADC) are described.

First claim

The invention claimed is:

1. An apparatus comprising:
a transmit signal path configured to upconvert a transmit signal using a transmit (TX) local oscillator (LO) having a TX LO frequency;
a receive signal path configured to downconvert a receive signal using a receive (RX) LO having the TX LO frequency, the receive signal path comprising a discrete-time analog filter configured to process the downconverted receive signal; and
a continuous-time band-pass filter coupled to the…

Assignees

• Qualcomm Inc

Inventors

• Sabouri Faramarz
• Cicalini Alberto

Classifications

• H04B1/403 Primary

  Electricity · mapped topic

• H04B1/40 Primary

  Electricity · mapped topic