Abstract
An analog baseband chain for a synthetic aperture radar receiver implemented in a 130 nm CMOS technology is presented in this paper. Occupying 0.23 mm2 of silicon area, the baseband chain consists of a three-stage variable gain amplifier (VGA), a 5th-order gm-C low-pass filter (LPF) and an output buffer. The gain of the chain can be controlled by tuning the control voltages of the VGA and has a range from 25 to 34 dB. 8 dB of the gain is embedded into the LPF. The bandwidth of the LPF is programmable from 100 to 190 MHz by means of capacitor matrices. The chain, which uses a 1.2 V supply voltage, achieves an input-referred noise density of 4 nV/\( \sqrt {\text{Hz}} \) and an in-band IIP3 of −46 dBV rms.
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Abbreviations
- SAR:
-
Synthetic aperture radar
- VGA:
-
Variable gain amplifier
- LPF:
-
Low-pass filter
- OBUF:
-
Output buffer
- ICs:
-
Integrated circuits
- LNA:
-
Low-noise amplifier
- ADC:
-
Analog-to-digital converter
- NMCs:
-
Negative Miller capacitors
- PVT:
-
Process, voltage and temperature
- CMFF:
-
Common-mode feedforward
- CMFB:
-
Common-mode feedback
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This work is supported by European Space Agency (ESA).
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Abu Bakar, F., Nehal, Q., Ukkonen, P. et al. Analog baseband chain of synthetic aperture radar (SAR) receiver. Analog Integr Circ Sig Process 75, 41–51 (2013). https://doi.org/10.1007/s10470-012-9979-4
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DOI: https://doi.org/10.1007/s10470-012-9979-4