Highly linear receiver front-end with thermal and phase noise cancellation
First Claim
1. A wireless communication device comprising:
- main signal path circuitry configured to receive a radio frequency (RF) signal at an RF node, the RF signal including a modulated RF signal and a blocking signal at a frequency offset Δ
fb, the main signal path circuitry including;
a first passive mixer configured to mix the RF signal and a first local oscillation (LO) signal to produce a down-converted RF signal; and
a first amplifier circuit configured to convert the down-converted RF signal to a first baseband signal having a data component, a thermal noise component, and a reciprocal mixing (RM) noise component that is a product of reciprocal mixing of the blocking signal;
a transconductance circuit coupled to the RF node and configured to convert the RF signal to a current signal;
a second passive mixer configured to mix the current signal with the first LO signal to produce a down-converted current signal having a data component near DC, the down-converted current signal further having a blocking signal component near a frequency offset Δ
fb from the data component, and a RM image near a frequency offset 2Δ
fb from the data component;
phase noise cancellation circuitry configured to mix the blocking signal component and the RM image of the down-converted current signal with a second LO signal to produce a RM noise cancellation signal; and
harmonic recombination circuitry configured to combine the first baseband signal and the RM noise cancellation signal to cancel at least a portion of the RM noise component of the first baseband signal.
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Accused Products
Abstract
A radio receiver supporting cancellation of thermal and phase noise in a down-converted RF signal. An inbound RF signal and blocking signal are provided directly to a passive mixer for down-conversion into a first baseband signal having data, thermal noise, and reciprocal mixing (RM) noise components. The inbound signals are also provided to a transconductance circuit, the output of which is provided to a second passive mixer for conversion into a current signal having data and blocking signal components, and a RM image. The blocking signal component and the RM image are mixed with a second LO signal, derived from the blocking signal, to produce a RM noise cancellation signal. The data component of the current signal is converted into a second baseband signal having data and thermal noise components. The first baseband signal, second baseband signal and RM noise cancellation signal are then combined through harmonic recombination.
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Citations
20 Claims
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1. A wireless communication device comprising:
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main signal path circuitry configured to receive a radio frequency (RF) signal at an RF node, the RF signal including a modulated RF signal and a blocking signal at a frequency offset Δ
fb, the main signal path circuitry including;a first passive mixer configured to mix the RF signal and a first local oscillation (LO) signal to produce a down-converted RF signal; and a first amplifier circuit configured to convert the down-converted RF signal to a first baseband signal having a data component, a thermal noise component, and a reciprocal mixing (RM) noise component that is a product of reciprocal mixing of the blocking signal; a transconductance circuit coupled to the RF node and configured to convert the RF signal to a current signal; a second passive mixer configured to mix the current signal with the first LO signal to produce a down-converted current signal having a data component near DC, the down-converted current signal further having a blocking signal component near a frequency offset Δ
fb from the data component, and a RM image near a frequency offset 2Δ
fb from the data component;phase noise cancellation circuitry configured to mix the blocking signal component and the RM image of the down-converted current signal with a second LO signal to produce a RM noise cancellation signal; and harmonic recombination circuitry configured to combine the first baseband signal and the RM noise cancellation signal to cancel at least a portion of the RM noise component of the first baseband signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for operating a wireless communication device comprising:
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receiving an inbound RF signal including a modulated RF signal and a blocking signal at a frequency offset Δ
fb;mixing the RF signal with a first local oscillation (LO) signal to produce a first baseband signal having a data component and reciprocal mixing (RM) noise that is a product of reciprocal mixing of the blocking signal; converting the inbound RF signal into a current signal; mixing the current signal with the first LO signal to produce a down-converted current signal having a data component near DC, a blocking signal component near a frequency offset Δ
fb from the data component, and a RM image near a frequency offset 2Δ
fb from the data component;mixing the blocking signal component and the RM image of the current signal with a second LO signal to produce a RM noise cancellation signal; and combining the first baseband signal and the RM noise cancellation signal to cancel at least a portion of the reciprocal mixing noise of the first baseband signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A radio frequency integrated circuit (RF IC) comprising:
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main signal path circuitry configured to receive and down-convert a radio frequency signal at an RF node, the RF signal including a modulated RF signal and a blocking signal at a frequency offset Δ
fb, including;a first passive mixer configured to mix the RF signal and a first local oscillation (LO) signal to produce a down-converted RF signal; a first amplifier circuit configured to convert the down-converted RF signal to a first baseband signal having a data component, a thermal noise component, and a reciprocal mixing (RM) noise component that is a product of reciprocal mixing of the blocking signal; a transconductance circuit coupled to the RF node and configured to convert the RF signal to a current signal; a second passive mixer configured to mix the current signal with the first LO signal to produce a down-converted current signal having a data component near DC, a blocking signal component near a frequency offset Δ
fb from the data component, and a RM image near a frequency offset 2Δ
fb from the data component;thermal noise cancellation circuitry configured to convert the data component of the down-converted current signal to a second baseband signal that approximates the data component and the thermal noise component of the first baseband signal; phase noise cancellation circuitry configured to mix the blocking signal component and the RM image of the down-converted current signal with a second LO signal to produce a RM noise cancellation signal, the RM noise cancellation signal comprising the RM image down-converted to near DC; and harmonic recombination circuitry configured to combine the first baseband signal, the second baseband signal, and the RM noise cancellation signal to remove at least a portion of the thermal noise component and the RM noise component of the first baseband signal to produce an inbound baseband signal. - View Dependent Claims (18, 19, 20)
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Specification