The Cleverscope CS448, an isolated high common-mode rejection ratio
four-channel 200MHz 14-bit oscilloscope, has been designed to measure high voltages--now up to 1,600V--for fast slew-rate signals such as those in a full or three-phase power electronics switching bridge.
has announced improvements to the Cleverscope CS448 - a unique isolated high common-mode rejection ratio
(CMRR) four-channel 200MHz 14-bit oscilloscope.
The requirements for instrumentation amplifiers are expressed in terms of high input impedance, low input-referred noise, low offset voltage, high differential gain, high common-mode rejection ratio
(CMRR) and high power supply rejection ratio (PSRR) [3, 10].
The common-mode rejection ratio
(CMRR) obtained by experimental measurements.
The amplifier enables higher common-mode rejection ratio
(CMRR) and power supply rejection ratio (PSRR) at all gain settings.
To provide a simple figure-of-merit for characterizing the implement differential filter, the common-mode rejection ratio
(CMRR) can be defined by
The simulation results show two full differential bandpass filters with bandwidths of 18.2% and 15%, and a common-mode rejection ratio
(CMRR) > 20 dB in the passband.
The AD8429 has a 90-dB CMRR (common-mode rejection ratio
) when operating in dc mode and an 80-dB CMRR in ac mode, which prevents unwanted signals from corrupting smaller signal acquisition.
These devices exceed 100 dB for common-mode rejection ratio
, power supply rejection ratio, as well as large signal voltage gain.
A high common-mode rejection ratio
improves the distortion performance of an amplifier when used in a non-inverting feedback configuration, which is the standard topology for most power amps.
These differential LNAs offer an optimum common-mode rejection ratio
(CMRR), K = CMRR = 20 log([A.sub.d]/[A.sub.c]), where [A.sub.d] is the differential mode gain of the device and [A.sub.c] is its common mode gain.