Method and apparatus for receiving radio frequency signals

A technology for receivers and input signals, applied in modulation and conversion balance devices, electrical components, demodulation, etc., can solve problems such as difficulties, low voltage margin gain, etc.

Inactive Publication Date: 2009-12-23
OPTIS WIRELESS TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, passive mixers generally have negative gain
As such, using traditional passive mixers and LNAs with deep sub-micron CMOS technologies becomes increasingly difficult due to the low voltage headroom and lack of gain these technologies bring

Method used

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  • Method and apparatus for receiving radio frequency signals
  • Method and apparatus for receiving radio frequency signals
  • Method and apparatus for receiving radio frequency signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] figure 1 One embodiment of a wireless communication device 10 (eg, mobile phone, wireless, cordless phone, personal digital assistant, global positioning system, wireless local area network (WLAN) adapter (eg, wireless network interface controller), etc.) is shown. Wireless device 10 receives and transmits information via RF signals. The device 10 includes a receiver front end 12 for down-converting the received RF signal r(t) to the desired baseband frequency signal B I (t) / B Q (t). The received signal is filtered eg by a bandpass filter 13 before being processed by the receiver front end 12 . The device 10 also includes a demodulator 14, an analog-to-digital converter 16 and a baseband processor 18 for processing the baseband signal B(n) e.g. by performing decoding, symbol estimation, interference cancellation, bit synchronization, error correction, etc. . Alternatively, the baseband processor 18 also performs signal demodulation. For heterodyne based receivers,...

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PUM

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Abstract

A frequency conversion receiver comprises a passive mixer, a Low-Noise Amplifier (LNA) and a balun. The low-noise amplifier generates an amplified single-ended signal responsive to a single-ended receiver input signal. The passive mixer generates a mixer output signal responsive to a differential mixer input signal and a four-phase local oscillator signal. The balun transforms the amplified singled-ended signal into the differential mixer input signal, the balun having a first winding coupled to an output of the low-noise amplifier and a second winding coupled to an input of the passive mixer, the second winding having more turns than the first winding. The turn ratio of the second winding to the first winding provides gain compensation to the low-noise amplifier, and in conjunction with the low-noise amplifier and the passive mixer, provides a desired gain to the receiver and linearity over a dynamic range of the receiver input signal.

Description

technical field [0001] The present invention relates generally to all radio receivers and in particular to direct frequency down conversion of radio frequency signals in radio receivers. Background technique [0002] In many wireless applications, radio frequency (RF) signals are used to transmit information. RF signals are formed by modulating a baseband signal (information) to a carrier signal that has a frequency greater than that of the baseband signal. Once received, the RF signal is finally down-converted to the desired baseband frequency before baseband signal processing occurs. The RF signal may be directly down-converted or may be processed in one or more intermediate stages before final down-conversion to the desired baseband frequency. A heterodyne-based receiver downconverts the received RF signal through one or more intermediate frequency (IF) stages until the desired baseband frequency is obtained. Each IF stage includes mixer, filter and / or amplifier stages...

Claims

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Application Information

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IPC IPC(8): H04B1/18H03D7/14
CPCH03D7/1441H03D7/1466H03D2200/009H03D7/1458H04B1/18H03D2200/0088H03D2200/0043H03D2200/0025H03D7/165H03D7/1483H03D2200/0023H03D7/166H03D7/14
Inventor 慕丰浩A·马滕森M·尼尔森
Owner OPTIS WIRELESS TECH LLC
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