CMOS amplifiers boast unprecedented low noise

10 August 2005 Analogue, Mixed Signal, LSI

Generally known for their low input bias current, CMOS amplifiers are inherently noisier than bipolar designs. However, Linear Technology has released a new class of CMOS amplifiers claimed to have voltage noise like bipolar amplifiers. The LTC6241 dual and LTC6242 quad amplifiers have exceptionally low noise of 550 nVp-p in the 0,1 Hz to 10 Hz region - a threefold reduction in voltage noise over existing CMOS amplifiers, claims Linear. Additionally, the devices have superior DC precision, featuring 1 pA bias current and less than 125 μV input offset voltage. Offset voltage drift is guaranteed under 2,5 μV/°C while the high voltage gain of 124 dB keeps down system error. The 18 MHz gain bandwidth and 10 V/μs slew rate at a low 2,2 mA max per amplifier make these amplifiers versatile and suited for use in a wide variety of signal processing applications. Their 3 pF input capacitance also makes them suited for high source impedance applications.

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