A Low Noise Low Power DC Coupled Sensor Amplifier with Offset Cancellation

A Low Noise Low Power DC Coupled Sensor Amplifier with Offset Cancellation

A 16-channel sensor amplifier was designed in the Jazz 0.18 ¿m CMOS process. The sensor amplifier has programmable gain from 20 to 2000 and a DC offset cancellation of ±0.3 V using bulk voltage control. A charge pump, band gap reference and a resistor string DAC were designed for bulk voltage contro...

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Bibliographische Detailangaben
Hauptverfasser: Krishnamurthy, Hari Krishnan, Robinson, Dirk, Rector, Dave M, La Rue, George S
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Electrodes
Filters
Integrated circuit noise
Linearity
Low-noise amplifiers
Noise cancellation
Operational amplifiers
Resistors
Sensor phenomena and characterization
Voltage
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Beschreibung
Zusammenfassung:A 16-channel sensor amplifier was designed in the Jazz 0.18 ¿m CMOS process. The sensor amplifier has programmable gain from 20 to 2000 and a DC offset cancellation of ±0.3 V using bulk voltage control. A charge pump, band gap reference and a resistor string DAC were designed for bulk voltage control. Input referred noise of 0.465 ¿V was achieved at a gain of 2000. The power required per channel was 900 ¿W and the supply voltages were ±V. Simulation results show the total harmonic distortion to be 0.017% and signal-to-noise-and-distortion (SINAD) ratio is 78 dB.
ISSN:1947-3834
1947-3842
DOI:10.1109/WMED.2010.5453750