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A 55 µW programmable gain amplifier with constant bandwidth for a direct conversion receiver

AuthorsMasuch, Jens ; Delgado-Restituto, Manuel
KeywordsProgrammable gain amplifier
Sallen-Key filter
Issue Date2011
PublisherThe International Society for Optics and Photonics
CitationV VLSI Circuits and Systems (2011)
SeriesProceedings of SPIE 8067
AbstractA fully differential programmable gain amplifier (PGA) with constant transfer characteristic and very low power consumption is proposed and implemented in a 130 nm CMOS technology. The PGA features a gain range of 4 dB to 55 dB with a step size of 6 dB and a constant bandwidth of 10-550 kHz. It employs two stages of variable amplification with an intermediate 2nd order low-pass channel filter. The first stage is a capacitive feedback OTA using current-reuse achieving a low input noise density of 16.7 nV/√Hz. This stage sets the overall high-pass cutoff frequency to approximately 10 kHz. For all gain settings the high-pass cutoff frequency variation is within ±5%. The low-pass channel filter is merged with a second amplifying stage forming a Sallen-Key structure. In order to maintain a constant transfer characteristic versus gain, the Sallen-Key feedback is taken from different taps of the load resistance. Using this new approach, the low-pass cutoff frequency stays between 440 kHz and 590 kHz for all gain settings (±14%). Finally, an offset cancelation loop reduces the output offset of the PGA to less than 5 mV (3σ). The PGA occupies an area of approximately 0.06 mm2 and achieves a post-layout power consumption of 55 μW from a 1V-supply. For the maximum gain setting the integrated input referred noise is 14.4 μVRMS while the total harmonic distortion is 0.7 % for a differential output amplitude of 0.5 V.
DescriptionComunicación presentada al "V VLSI Circuits and Systems" celebrado en Praga (República Checa) el 18 de Abril del 2011.
Publisher version (URL)http://dx.doi.org/10.1117/12.886994
Appears in Collections:(IMSE-CNM) Libros y partes de libros
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