US20170099068A1 - Power reduction in noise-cancelling receivers - Google Patents
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- US20170099068A1 US20170099068A1 US14/882,836 US201514882836A US2017099068A1 US 20170099068 A1 US20170099068 A1 US 20170099068A1 US 201514882836 A US201514882836 A US 201514882836A US 2017099068 A1 US2017099068 A1 US 2017099068A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
Definitions
- This disclosure relates to the antenna interface to a noise cancelling receiver.
- FIG. 1 shows an example communication device with an enhanced noise-cancelling receiver circuit.
- FIG. 2 shows an example circuit including a noise-cancelling receiver with passive front-end gain.
- FIG. 3 is an example of a matching network and response.
- FIG. 4 is another example of matching network and response.
- FIG. 5 is a flow diagram of processing received signals.
- noise-cancelling receivers provide the best trade-off between noise figure and linearity for a matched wideband receiver.
- These noise-cancelling receivers are presented in, for instance, Murphy, et al, A Blocker-Tolerant Wideband Noise-Cancelling Receiver with a 2 dB Noise Figure, IEEE International Solid-State Circuits Conference, pp. 74-76, February 2012; U.S. Pat. Pub. No. 2014-0171006; U.S. Pat. Pub. No. 2014-0057584; and U.S. Pat. Pub. No. 2014-0045443.
- the noise-cancelling receivers include, among other circuitry, a radio-frequency (RF) transconductance (GM) stage, baseband transimpedance amplifiers (TIAs), and local oscillator generators (LOGENs). All of the circuitry, and particularly the RF-GM stage, consumes power.
- RF radio-frequency
- GM radio-frequency
- TAAs baseband transimpedance amplifiers
- LOGENs local oscillator generators
- the circuit designs discussed below apply a passive front-end gain to the received signal prior to the noise cancelling receiver (RX).
- the passive front-end gain reduces the power consumption requirements of the RF-GM stage.
- the passive front-end may also reduce the power consumption of the baseband TIAs and LOGEN path, given the smaller mixer switches that may be used.
- the circuit configuration of a passive front-end gain prior to a noise-cancelling receiver has never been previously documented. This is due to (at least in part) to the intricacies of noise-cancelling receiver designs and the non-obvious affects that passive gain has on the designs.
- a noise-cancelling RX with passive gain is superior to all other known narrowband receivers in terms of noise, linearity, and matching.
- the circuit designs discussed below provide a lower-power narrowband noise-cancelling receiver that maintains a low-noise figure and excellent linearity.
- FIG. 1 shows an example device 100 with an enhanced noise-cancelling receiver circuit.
- the device 100 is a smart phone in this example, but the device 100 could be any type of device that wirelessly receives signals.
- the device 100 includes device circuitry that implements any desired functionality. Examples of device circuitry in FIG. 1 include the communication interfaces 102 , system circuitry 104 , I/O circuitry 106 , and user interfaces 107 .
- the system circuitry 104 may be implemented, for example, with one or more systems on a chip (SoC), application specific integrated circuits (ASIC), central processing units (CPUs), discrete analog and digital circuits, and other circuitry.
- SoC systems on a chip
- ASIC application specific integrated circuits
- CPUs central processing units
- the I/O circuitry 106 may include general purpose I/O circuitry, e.g., for universal serial bus (USB) I/O, audio output, microphone input, or for implementing a flash memory expansion card interface.
- the user interfaces 107 may include a display, e.g., a touch sensitive display, on which the system circuitry 104 renders a graphical user interface (GUI) to facilitate device operation.
- GUI graphical user interface
- the communication interfaces 102 include wireless transceiver circuitry 108 .
- the wireless transceiver circuitry 108 processes signals that the antenna 110 receives.
- the communication interfaces 102 include one or more instances wireless transceivers and antennas with enhanced receiver circuitry 112 .
- the enhanced receiver circuitry 112 includes a passive gain front-end 114 to a noise cancelling receiver 116 .
- FIG. 2 shows an example 200 of the enhanced receiver circuitry 112 .
- the example 200 includes a noise-cancelling receiver 202 and passive front-end gain implemented with the matching network 204 .
- the noise-cancelling receiver 202 may operate over any selected frequency range, e.g., 0 to 3 GHz, and the frequency range may be narrowed in response to the matching network 204 .
- the matching network 204 is part of a circuit model 206 of an antenna, noise source, and the matching network 204 .
- the circuit model 206 models an antenna generating the ideal received signal V S and resistance R S .
- the circuit model 206 includes a noise source 208 .
- the circuit model 206 has a corresponding Thevenin equivalent model 210 .
- the Thevenin equivalent model 210 characterizes the combination of the antenna, noise source and the matching network 204 .
- the Thevenin equivalent model 210 indicates that the combination has an open circuit voltage gain of beta, p and a series impedance of Z S .
- the matching network 204 is chosen to provide a passive voltage gain (i.e., ⁇ >1), with corresponding reduction in current so that there is no net power consumption across the matching network 204 .
- the passive gain of more than 1 provided by the matching network 204 reduces a noise cancelling current requirement in the noise-cancelling receiver 202 by more than ⁇ , e.g., by ⁇ 2 .
- the noise-cancelling receiver 202 includes two distinct downconversion paths: a main path 212 that provides impedance matching and current measurement, and an auxiliary path 214 with a transconductance stage 216 that provides a measure of the voltage at the RF input.
- Each path includes multiple mixer outputs and subsequent individual processing stages.
- the impedance looking into the main path 212 is configured to be the complex conjugate of Z S , to provide an impedance match to the circuitry providing signals to the receiver input port 224 .
- the oscillator circuitry 218 and 220 changes frequency to change the center frequency of the noise-cancelling receiver 202 , which provides a low noise figure with excellent linearity over a wide bandwidth (e.g., 0 to 3 GHz).
- a subsequent weighting and recombination stage 226 generates the inphase and quadrature outputs representing the noise-cancelled received signal.
- Specific implementation details of the noise-cancelling receiver 202 may be found in, e.g., Murphy, et al, A Blocker - Tolerant Wideband Noise - Cancelling Receiver with a 2 dB Noise Figure , IEEE International Solid-State Circuits Conference, pp. 74-76, February 2012.
- noise figure is given by the expression:
- ⁇ is a technology-fixed constant, e.g., about (2 ⁇ 3) depending on the particular design of the transconductance stage 216 .
- the expression for the noise figure indicates that increasing G M will beneficially drive the noise figure to 1, the ideal value.
- the circuit design may make G M very large.
- G M is directly proportional to current, and as a result, increasing G M quickly increases power consumption. Not every design can afford the resulting increase in power consumption.
- the matching network 204 provides a solution to increased power consumption.
- the matching network 204 provides a passive voltage gain to the signal received by the antenna. That is, the matching network 204 transforms the voltage at the antenna port 222 to a higher voltage at the receiver input port 224 . There is a corresponding reduction in current and no power gain and no power consumed by the matching network 204 .
- a voltage gain, ⁇ , of 10 would allow a reduction of G M by 100, with a significant corresponding reduction in power consumption, while achieving the same noise figure.
- the voltage gain may vary widely according to the particular design requirements for a given implementation, e.g., between 1.5 and 10.
- FIG. 3 is an example 300 of a matching network 302 and its response characteristics 304 .
- the matching network 302 is a step-up transformer 306 with a 1:1.5 turn ratio.
- the step-up transformer 306 provides a voltage gain of 1.5 with a corresponding current reduction of 1.5 so that no power is dissipated across the step-up transformer 306 .
- the response characteristics 304 assume an ideal transformer and show constant performance across frequency for voltage gain 308 , scattering parameter S 11 310 , and impedance 312 .
- Transceivers are often designed such that S 11 is less than ⁇ 10 dB. When this condition is met, the receiver is generally considered “impedance matched,” an important condition for any receiver that interfaces to an antenna. As demonstrated by the examples in FIGS. 3 and 4 , the noise-cancelling receiver described here allows for impedance matching with low noise and reduced current requirements. While the noise cancelling receiver with passive gain may demonstrate somewhat reduced linearity and a potential narrowing of the receive bandwidth, both tradeoffs are still less than would be experienced in a conventional receiver with passive gain, e.g., a receiver with a common-source architecture experiencing inductive degeneration.
- FIG. 4 is another example 400 of matching network 402 and its response characteristics 404 .
- the matching network 402 is an inductor-capacitor ladder network 406 .
- the ladder network 406 effectively, implements a lowpass filter with a bandwidth of approximately 0 to 6 GHz with gain of approximately 1.5.
- the response characteristics 404 show the variation across frequency for voltage gain 408 , scattering parameter S 11 410 , and impedance, including the real component 412 and imaginary component 414 .
- some implementations of the matching network 204 may provide a bandwidth specific implementation, e.g., a 6 GHz bandwidth between 0-6 GHz, or a 50 MHz bandwidth, or any other pre-determined bandwidth.
- Bandwidth specificity is often not a significant drawback, as the majority of receivers are narrowband in design because they are designed for specific applications with narrowband signaling. That is, the bandwidth specific implementation provides significant power reduction but does not hinder the operation of the application specific receiver.
- FIG. 5 shows the operation of the enhanced noise-cancelling receiver circuitry.
- a passive gain front-end e.g., the matching network 204
- the circuitry receives signals at the antenna ( 504 ).
- the passive gain front-end performs voltage amplification on signals (i.e., voltage gain >1), to obtain amplified signals ( 506 ).
- the voltage amplified signals are communicated to the input port 224 the noise-cancelling receiver 202 ( 508 ).
- the noise-cancelling receiver 202 performs noise-cancellation processing on voltage amplified signals, e.g., using a main path 212 and an auxiliary path 214 with subsequent weighting and recombination ( 510 ).
- the noise-cancelling receiver 202 may exhibit dramatically reduced power consumption, e.g., because less amplification is applied in the transconductance stage 216 of the auxiliary path 214 .
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
- This application claims priority to provisional application Ser. No. 62/235,894, filed Oct. 1, 2015, which is entirely incorporated by reference.
- This disclosure relates to the antenna interface to a noise cancelling receiver.
- Rapid advances in electronics and communication technologies, driven by immense customer demand, have resulted in the widespread adoption of devices such as smart phones, tablet computers, and network peripherals that employ wireless receivers. In most of such devices, energy consumption is of interest, and reduced energy consumption is often a design goal. At the same time, the wireless receivers must perform well even in difficult operating environments.
-
FIG. 1 shows an example communication device with an enhanced noise-cancelling receiver circuit. -
FIG. 2 shows an example circuit including a noise-cancelling receiver with passive front-end gain. -
FIG. 3 is an example of a matching network and response. -
FIG. 4 is another example of matching network and response. -
FIG. 5 is a flow diagram of processing received signals. - Recently proposed noise-cancelling receivers provide the best trade-off between noise figure and linearity for a matched wideband receiver. These noise-cancelling receivers are presented in, for instance, Murphy, et al, A Blocker-Tolerant Wideband Noise-Cancelling Receiver with a 2 dB Noise Figure, IEEE International Solid-State Circuits Conference, pp. 74-76, February 2012; U.S. Pat. Pub. No. 2014-0171006; U.S. Pat. Pub. No. 2014-0057584; and U.S. Pat. Pub. No. 2014-0045443. The noise-cancelling receivers include, among other circuitry, a radio-frequency (RF) transconductance (GM) stage, baseband transimpedance amplifiers (TIAs), and local oscillator generators (LOGENs). All of the circuitry, and particularly the RF-GM stage, consumes power.
- The circuit designs discussed below apply a passive front-end gain to the received signal prior to the noise cancelling receiver (RX). The passive front-end gain reduces the power consumption requirements of the RF-GM stage. The passive front-end may also reduce the power consumption of the baseband TIAs and LOGEN path, given the smaller mixer switches that may be used. The circuit configuration of a passive front-end gain prior to a noise-cancelling receiver has never been previously documented. This is due to (at least in part) to the intricacies of noise-cancelling receiver designs and the non-obvious affects that passive gain has on the designs. In the same way that a noise-cancelling RX is superior to all other known wideband receivers in terms of noise, linearity, and matching, a noise-cancelling RX with passive gain is superior to all other known narrowband receivers in terms of noise, linearity, and matching. The circuit designs discussed below provide a lower-power narrowband noise-cancelling receiver that maintains a low-noise figure and excellent linearity.
-
FIG. 1 shows anexample device 100 with an enhanced noise-cancelling receiver circuit. Thedevice 100 is a smart phone in this example, but thedevice 100 could be any type of device that wirelessly receives signals. Thedevice 100 includes device circuitry that implements any desired functionality. Examples of device circuitry inFIG. 1 include thecommunication interfaces 102,system circuitry 104, I/O circuitry 106, and user interfaces 107. Thesystem circuitry 104 may be implemented, for example, with one or more systems on a chip (SoC), application specific integrated circuits (ASIC), central processing units (CPUs), discrete analog and digital circuits, and other circuitry. The I/O circuitry 106 may include general purpose I/O circuitry, e.g., for universal serial bus (USB) I/O, audio output, microphone input, or for implementing a flash memory expansion card interface. The user interfaces 107 may include a display, e.g., a touch sensitive display, on which thesystem circuitry 104 renders a graphical user interface (GUI) to facilitate device operation. - In the example shown in
FIG. 1 , thecommunication interfaces 102 includewireless transceiver circuitry 108. Thewireless transceiver circuitry 108 processes signals that theantenna 110 receives. As will be described in more detail below, thecommunication interfaces 102 include one or more instances wireless transceivers and antennas with enhancedreceiver circuitry 112. The enhancedreceiver circuitry 112 includes a passive gain front-end 114 to anoise cancelling receiver 116. -
FIG. 2 shows an example 200 of the enhancedreceiver circuitry 112. The example 200 includes a noise-cancellingreceiver 202 and passive front-end gain implemented with thematching network 204. The noise-cancellingreceiver 202 may operate over any selected frequency range, e.g., 0 to 3 GHz, and the frequency range may be narrowed in response to thematching network 204. InFIG. 2 , thematching network 204 is part of acircuit model 206 of an antenna, noise source, and thematching network 204. In particular, thecircuit model 206 models an antenna generating the ideal received signal VS and resistance RS. Thecircuit model 206 includes anoise source 208. - The
circuit model 206 has a corresponding Theveninequivalent model 210. The Theveninequivalent model 210 characterizes the combination of the antenna, noise source and thematching network 204. In particular, the Theveninequivalent model 210 indicates that the combination has an open circuit voltage gain of beta, p and a series impedance of ZS. Thematching network 204 is chosen to provide a passive voltage gain (i.e., β>1), with corresponding reduction in current so that there is no net power consumption across thematching network 204. In sharp contrast to prior designs in which the matching network was a unity gain matching network, the passive gain of more than 1 provided by thematching network 204 reduces a noise cancelling current requirement in the noise-cancellingreceiver 202 by more than β, e.g., by β2. - The noise-cancelling
receiver 202 includes two distinct downconversion paths: amain path 212 that provides impedance matching and current measurement, and anauxiliary path 214 with atransconductance stage 216 that provides a measure of the voltage at the RF input. Each path includes multiple mixer outputs and subsequent individual processing stages. The multiple path design is denoted inFIG. 2 with the notation <0:M−1>, e.g., M=8. In some implementations, the impedance looking into themain path 212 is configured to be the complex conjugate of ZS, to provide an impedance match to the circuitry providing signals to thereceiver input port 224. - The
oscillator circuitry receiver 202, which provides a low noise figure with excellent linearity over a wide bandwidth (e.g., 0 to 3 GHz). A subsequent weighting andrecombination stage 226 generates the inphase and quadrature outputs representing the noise-cancelled received signal. Specific implementation details of the noise-cancellingreceiver 202 may be found in, e.g., Murphy, et al, A Blocker-Tolerant Wideband Noise-Cancelling Receiver with a 2 dB Noise Figure, IEEE International Solid-State Circuits Conference, pp. 74-76, February 2012. - One aspect of the noise-cancelling
receiver 202 is its noise figure. When thematching network 204 is not used, the noise figure, F, is given by the expression: -
- with overall system gain:
-
A v ≈G M Z AUX - In the expression above, γ is a technology-fixed constant, e.g., about (⅔) depending on the particular design of the
transconductance stage 216. The expression for the noise figure indicates that increasing GM will beneficially drive the noise figure to 1, the ideal value. In some systems in which power consumption is not a concern, the circuit design may make GM very large. However, GM is directly proportional to current, and as a result, increasing GM quickly increases power consumption. Not every design can afford the resulting increase in power consumption. - The
matching network 204 provides a solution to increased power consumption. Thematching network 204 provides a passive voltage gain to the signal received by the antenna. That is, thematching network 204 transforms the voltage at theantenna port 222 to a higher voltage at thereceiver input port 224. There is a corresponding reduction in current and no power gain and no power consumed by thematching network 204. - When the
matching network 204 is present, the noise figure, F, is given by the expression: -
- with overall system gain:
-
A v ≈βG M Z AUX - Thus, for example, a voltage gain, β, of 10 would allow a reduction of GM by 100, with a significant corresponding reduction in power consumption, while achieving the same noise figure. The voltage gain may vary widely according to the particular design requirements for a given implementation, e.g., between 1.5 and 10.
-
FIG. 3 is an example 300 of amatching network 302 and itsresponse characteristics 304. In particular, thematching network 302 is a step-uptransformer 306 with a 1:1.5 turn ratio. The step-uptransformer 306 provides a voltage gain of 1.5 with a corresponding current reduction of 1.5 so that no power is dissipated across the step-uptransformer 306. Theresponse characteristics 304 assume an ideal transformer and show constant performance across frequency forvoltage gain 308, scatteringparameter S 11 310, andimpedance 312. - Transceivers are often designed such that S11 is less than −10 dB. When this condition is met, the receiver is generally considered “impedance matched,” an important condition for any receiver that interfaces to an antenna. As demonstrated by the examples in
FIGS. 3 and 4 , the noise-cancelling receiver described here allows for impedance matching with low noise and reduced current requirements. While the noise cancelling receiver with passive gain may demonstrate somewhat reduced linearity and a potential narrowing of the receive bandwidth, both tradeoffs are still less than would be experienced in a conventional receiver with passive gain, e.g., a receiver with a common-source architecture experiencing inductive degeneration. -
FIG. 4 is another example 400 of matchingnetwork 402 and itsresponse characteristics 404. In particular, thematching network 402 is an inductor-capacitor ladder network 406. Theladder network 406, effectively, implements a lowpass filter with a bandwidth of approximately 0 to 6 GHz with gain of approximately 1.5. Theresponse characteristics 404 show the variation across frequency forvoltage gain 408, scatteringparameter S 11 410, and impedance, including thereal component 412 andimaginary component 414. - Note that some implementations of the
matching network 204 may provide a bandwidth specific implementation, e.g., a 6 GHz bandwidth between 0-6 GHz, or a 50 MHz bandwidth, or any other pre-determined bandwidth. Bandwidth specificity is often not a significant drawback, as the majority of receivers are narrowband in design because they are designed for specific applications with narrowband signaling. That is, the bandwidth specific implementation provides significant power reduction but does not hinder the operation of the application specific receiver. -
FIG. 5 shows the operation of the enhanced noise-cancelling receiver circuitry. In the circuit design, a passive gain front-end (e.g., the matching network 204) is inserted between an antenna and a noise-cancelling receiver 202 (502). The circuitry receives signals at the antenna (504). The passive gain front-end performs voltage amplification on signals (i.e., voltage gain >1), to obtain amplified signals (506). The voltage amplified signals are communicated to theinput port 224 the noise-cancelling receiver 202 (508). In response, the noise-cancellingreceiver 202 performs noise-cancellation processing on voltage amplified signals, e.g., using amain path 212 and anauxiliary path 214 with subsequent weighting and recombination (510). The noise-cancellingreceiver 202 may exhibit dramatically reduced power consumption, e.g., because less amplification is applied in thetransconductance stage 216 of theauxiliary path 214. - Various implementations have been specifically described. However, many other implementations are also possible.
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US8422979B2 (en) | 2011-03-17 | 2013-04-16 | Broadcom Corporation | Method and system for low-noise, highly-linear receiver front-end |
US8514021B2 (en) * | 2011-05-19 | 2013-08-20 | Renesas Mobile Corporation | Radio frequency integrated circuit |
US8750818B2 (en) * | 2012-04-13 | 2014-06-10 | Mediatek Inc. | Signal processing circuit with circuit induced noise cancellation |
US9246436B2 (en) * | 2012-07-16 | 2016-01-26 | Linear Technology Corporation | Low power radio receiver |
US9219507B2 (en) * | 2012-08-13 | 2015-12-22 | Broadcom Corporation | Blocker-tolerant wideband noise-canceling receivers |
US9059796B2 (en) | 2012-12-13 | 2015-06-16 | Broadcom Corporation | Wideband receiver robust to radio frequency harmonics |
US9000860B2 (en) * | 2012-12-18 | 2015-04-07 | Broadcom Corporation | Low-loss TX-to-RX isolation using electrical balance duplexer with noise cancellation |
US9025709B2 (en) * | 2013-05-30 | 2015-05-05 | Mediatek Inc. | Receiver front-end circuit, communication unit and method therefor |
US9496840B2 (en) * | 2014-05-16 | 2016-11-15 | Linear Technology Corporation | Radio receiver |
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