Chopper-stabilized instrumentation amplifier for wireless telemetry
First Claim
1. A wireless telemetry receiver comprising:
- a mixer amplifier that amplifies a modulated telemetry signal to produce an amplified signal and demodulates the amplified signal at a clock frequency to produce an output signal;
a modulator that modulates an amplitude of the output signal at the clock frequency; and
a feedback path that applies the modulated output signal as a feedback signal to the modulated telemetry signal.
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Accused Products
Abstract
This disclosure describes a chopper stabilized instrumentation amplifier. The amplifier is configured to achieve stable measurements at low frequency with very low power consumption. The instrumentation amplifier uses a differential architecture and a mixer amplifier to substantially eliminate noise and offset from an output signal produced by the amplifier. Dynamic limitations, i.e., glitching, that result from chopper stabilization at low power are substantially eliminated through a combination of chopping at low impedance nodes within the mixer amplifier and feedback. The signal path of the amplifier operates as a continuous time system, providing minimal aliasing of noise or external signals entering the signal pathway at the chop frequency or its harmonics. The amplifier can be used in a low power system, such as an implantable medical device. The amplifier may be used for physiological signal sensing, impedance sensing, telemetry or other test and measurement applications.
133 Citations
36 Claims
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1. A wireless telemetry receiver comprising:
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a mixer amplifier that amplifies a modulated telemetry signal to produce an amplified signal and demodulates the amplified signal at a clock frequency to produce an output signal; a modulator that modulates an amplitude of the output signal at the clock frequency; and a feedback path that applies the modulated output signal as a feedback signal to the modulated telemetry signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 34, 35, 36)
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14. A wireless telemetry receiver comprising:
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means for amplifying a modulated telemetry signal to produce an amplified signal; means for demodulating the amplified signal at a clock frequency to produce an output signal; means for modulating an amplitude of the output signal at the clock frequency; and means for applying the modulated output signal as a feedback signal to the modulated telemetry signal. - View Dependent Claims (33)
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15. A method comprising:
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amplifying a modulated telemetry signal to produce an amplified signal; demodulating the amplified signal at a clock frequency to produce an output signal; modulating an amplitude of the output signal at the clock frequency; and applying the modulated output signal as a feedback signal to the modulated telemetry signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 31, 32)
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27. An implantable medical device comprising:
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an antenna that receives a modulated telemetry signal; a mixer amplifier that amplifies the modulated telemetry signal to produce an amplified signal and demodulates the amplified signal at a clock frequency to produce an output signal; a modulator that modulates an amplitude of the output signal at the clock frequency; and a feedback path that applies the modulated output signal as a feedback signal to the modulated telemetry signal. - View Dependent Claims (30)
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28. A medical device system comprising:
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a medical device programmer comprising a modulator that modulates a telemetry signal at a clock frequency, and a first antenna that transmits the modulated telemetry signal; and an implantable medical device comprising; a second antenna that receives the modulated telemetry signal, a mixer amplifier that amplifies the modulated telemetry signal to produce an amplified signal and demodulates the amplified signal at a clock frequency to produce an output signal, a modulator that modulates an amplitude of the output signal at the clock frequency, and a feedback path that applies the modulated output signal as a feedback signal to the modulated telemetry signal. - View Dependent Claims (29)
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Specification