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A highly linear embedded filtering passive mixer

A mixer, linear mixing technology, applied in the field of circuits

Active Publication Date: 2011-02-23
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Third, the TB performance of the overall system can be degraded due to the LMS loop
However, this approach may have limited feasibility in real production due to bond wire variations

Method used

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  • A highly linear embedded filtering passive mixer
  • A highly linear embedded filtering passive mixer
  • A highly linear embedded filtering passive mixer

Examples

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Embodiment Construction

[0030] Communication channels have highly linear switched current mixers incorporating embedded wireless for improved transmit (Tx) and receive (Rx) without external surface acoustic wave (SAW) filtering components for Tx leakage / noise suppression Source filtering (eg low pass, notch). High IIP of the receiver under Tx offset 2 (input referred to second order intercept point) is necessary to avoid corrupting the sensitivity performance of the system, and a high triple beat (TB) is required to avoid sensitivity degradation due to transmitter leakage. Due to the embedded filtering in the mixer and the active post-distortion (APD) approach in the low-noise amplifier (LNA), the required high linearity is achieved at low noise figure and power consumption, thus making it possible without the use of SAW (Surface Acoustic Wave ) filter to overcome transmitter power leakage. An illustrative receiver integrated circuit (IC) exhibits Rx IIP greater than +60dBm at 900MHz Rx frequency w...

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Abstract

A communication channel has a highly linear switched current mixer that incorporates passive filtering (e.g., low pass, notch) for improved transmitting (Tx) and receiving (Rx) with adding external filtering components. A high IIP2 (input referenced second order intercept point) of the receiver at the Tx offset is essential to avoid corrupting the system's sensitivity performance, and a high triple beat (TB) is required to avoid sensitivity degradation due to transmitter leakage. Thanks to the embedded filtering in the mixer and the active post-distortion (APD) method in a low noise amplifier (LNA), the required high linearity is achieved with low noise figure and power consumption, overcoming transmitter power leakage without the use of a SAW (surface acoustic wave) filter.

Description

[0001] Claim of priority under 35 U.S.C. §119 [0002] This patent application claims priority to Provisional Application No. 61 / 043,015, filed April 7, 2008, entitled "A Highly Linear Embedded Filtering Passive Mixer," And said provisional application is assigned to the present assignee and is hereby expressly incorporated herein by reference. technical field [0003] The present invention relates generally to circuits and, more particularly, to an amplifier suitable for wireless communications and other applications. Background technique [0004] Zero-IF (intermediate frequency) radio frequency (RF) front-end architectures are attractive for cellular systems due to lower cost and bill of materials (BOM). A direct conversion receiver (DCR), also known as a homodyne, synchronous, or zero-IF receiver, demodulates an incoming signal by mixing it with a local oscillator signal that is synchronized in frequency with the carrier of the desired signal radio receiver design. Th...

Claims

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Application Information

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IPC IPC(8): H03D7/16
CPCH03D7/163H03D7/166H03D7/1466
Inventor 金那苏普拉萨德·S·古德姆阿帕林·弗拉迪米尔
Owner QUALCOMM INC
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