Low noise, low power subsampling receiver
AssigneeStanford University
InventorsCarsten Barth, Umran S. Inan, Ivan Richard Linscott
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Abstract
Techniques for a receiver includes a low noise amplifier, a Q-enhanced bandpass filter on a chip, and an analog to digital converter (ADC) at a sub-sampling speed suitable for an intermediate frequency (IF) signal. In some embodiments, a temperature compensation circuit is included. The receiver has an effective noise level less than 7 dB. In some embodiments a 1-bit ADC is used. In some of these embodiments, one or more switches in the ADC are inverted to cancel charge injection.
Claims21
An apparatus comprising:
- a low noise amplifier (LNA) for a radio frequency signal that includes a carrier wave at a carrier wave frequency;
- an analog to digital converter (ADC) for a sampling frequency that is much less than the carrier wave frequency;
- and
- a Q-enhanced CMOS bandpass filter that substantively blocks frequencies above half the sampling frequency, wherein the Q-enhanced CMOS bandpass filter is electrically connected between the low noise amplifier and the ADC.
A method comprising:
- filtering a first radio frequency signal with a Q-enhanced CMOS bandpass filter that substantively blocks frequencies above half a sampling frequency;
- and
- sampling a second radio frequency signal based on a filtered signal output by the Q-enhanced CMOS bandpass filter at or near the sampling frequency.
An apparatus comprising:
- means for filtering a first radio frequency signal with a Q-enhanced CMOS bandpass filter that substantively blocks frequencies above half a sampling frequency;
- and
- means for sampling a second radio frequency signal based on a filtered signal output by the Q-enhanced CMOS bandpass filter at or near the sampling frequency.
A Q-enhanced CMOS bandpass filter comprising:
- an inductor spiral on an integrated circuit;
- a capacitor in parallel with the inductor spiral;
- and
- a negative resistance circuit disposed in parallel with the spiral inductor and capacitor.
Dependencies are inferred from the claim text.