APPARATUS AND METHOD FOR RADIO FREQUENCY RECEPTION WITH TEMPERATURE AND FREQUENCY INDEPENDENT GAIN
First Claim
1. An apparatus comprising:
- a front end having an input and an output, the front end forming at least part of a radio frequency (RF) signal receive path, the front end comprising;
a front-end resistor of the receive path, the front-end resistor configured to receive an input signal from the input of the front end;
a passive mixer located downstream of the front-end resistor in the receive path, the passive mixer being configured to mix the input signal from the front-end resistor with a local oscillation signal, wherein the passive mixer is not coupled to a voltage reference for biasing;
a transimpedance amplifier located downstream of the passive mixer on the receive path; and
a feedback resistor coupled between an input and an output of the transimpedance amplifier.
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Abstract
Apparatus and methods are disclosed, such as those involving an RF receiver. One such apparatus includes a front end having an input and an output. The front end forms part of an RF signal receive path. The front end includes a front-end resistor configured to receive an input signal; and a passive mixer downstream of the front-end resistor on the receive path. The passive mixer mixes the input signal with a local oscillation signal. The front-end includes a transimpedance amplifier located downstream of the passive mixer on the receive path. The transimpedance amplifier includes an input and an output. The front end further includes a feedback resistor coupled between the input and output of the transimpedance amplifier. The gain of the front end is a ratio of the feedback resistance to the front-end resistance, and is temperature- and frequency-insensitive. The apparatus also provides relatively constant input impedance and high linearity.
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Citations
41 Claims
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1. An apparatus comprising:
a front end having an input and an output, the front end forming at least part of a radio frequency (RF) signal receive path, the front end comprising; a front-end resistor of the receive path, the front-end resistor configured to receive an input signal from the input of the front end; a passive mixer located downstream of the front-end resistor in the receive path, the passive mixer being configured to mix the input signal from the front-end resistor with a local oscillation signal, wherein the passive mixer is not coupled to a voltage reference for biasing; a transimpedance amplifier located downstream of the passive mixer on the receive path; and a feedback resistor coupled between an input and an output of the transimpedance amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus comprising:
a front end for processing a radio frequency (RF) signal, the front end comprising; a first front-end resistor configured to convert a voltage signal to generate a first current signal; a first mixer configured to pass the first current signal at least partly in response to one or more first local oscillation signals, wherein the first mixer is not coupled to a voltage reference for biasing; a first transimpedance amplifier configured to amplify the current signal from the first mixer to generate an amplified voltage signal; and a first feedback resistor configured to feed the amplified voltage signal back to an input of the transimpedance amplifier. - View Dependent Claims (26, 27, 28, 29)
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30. An electronic device comprising:
a receive path to receive and process a wireless signal, the receive path comprising; an input resistor having a first end and a second end, the first end being configured to receive an input signal; a switch having a first terminal and a second terminal, the first terminal being electrically coupled to the second end of the input resistor, wherein the switch is configured to receive the input signal from the input resistor, and to selectively pass the input signal at least partially in response to a local oscillation signal; a transimpedance amplifier having an input and an output, the input being electrically coupled to the second terminal of the switch; and a feedback resistor coupled between the input and output of the transimpedance amplifier. - View Dependent Claims (31, 32, 33)
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34. A method comprising:
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processing an input signal through a front end of a radio frequency (RF) receive path, wherein processing the input signal comprises; passing the input signal through a front-end resistor to generate a passed input signal; mixing the passed input signal with a local oscillation signal to generate a mixed signal, wherein mixing is performed by a passive mixer; amplifying the mixed signal, using a transimpedance amplifier having an input and an output, to generate an amplified signal at the output; and providing the amplified signal to the input of the transimpedance amplifier through a feedback resistor; wherein the front end has a gain based at least partly on a ratio of the resistance of the feedback resistor to the resistance of the front-end resistor, and wherein the gain is substantially temperature insensitive. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41)
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Specification