The advantages of employing chopper stabilization for the implementation of IAs are high
CMRR, high accuracy, low drift, suppression of low-frequency noise with low signal aliasing and can achieve rail-to-rail input operation [14].
In the proposed scheme, the implementation requires matched resistor pair; however, it is shown that high
CMRR can be achieved by 1 % matching ratio of the resistors.
Supply voltage Gain PM GM BW 1.8 V 103 dB 49[degrees] 11.46 dB 12.4 KHz degree Supply voltage SR [ICMR.sup.-] [ICMR.sup.+]
CMRR 1.8 V 151.50 V/ 71.45 mV 1.60 mV 71.27 dB [micro]S Supply voltage [PSRR.sup.+] [PSRR.sup.-] Offset Pd 1.8 V 73.60 dB 81.75 dB 11.30 mV 316.24 [micro]W Table 2: Performance summary of the comparator.
Correia MA, Maciel
CMRR, Nascimento LDS, Maciel Jr A.
*
CMRR: recomienda un
CMRR minimo de 100 dB; para cumplir con este requerimiento se utilizo el AD620, que es un amplificador de instrumentacion disenado para aplicaciones biomedicas y que garantiza un
CMRR minimo de 100 dB.
The device has a common-mode rejection ratio (
CMRR) >80 dB, with sampling frequency configured at 2000 Hz and the signal was filtered between 20 and 500 Hz.
Suponiendo que es el caso y se necesita una celda basica que debe cumplir solo las especificaciones de la tabla 1, para un diseno completo habria que considerar otras caracteristicas como el factor de rechazo en modo comun (
CMRR), respuesta en frecuencia de la ganancia en modo comun, factor de rechazo a fuentes (PSRR), variacion del voltaje de offset con la temperatura, etcetera.
Though this topology can achieve common-mode rejection (
CMRR) above 80 dB at DC, the
CMRR dramatically degrades as frequency increases.
To achieve this, we used a INA128 biomedical instrumentation amplifier manufactured from Texas Instruments[R], which has a
CMRR of 120 dB, necessary to acquire such signals.
(b) With sinusoid signals, 20 dB/decade frequency roll-off had been observed at 3.3 MHz onwards; measured
CMRR [approximately equal to] 57 dB at [V.sub.2] = [-V.sub.1]
(1) Service of Neurology and
CMRR, Neuropsychology Unit, University Hospital of Strasbourg, 1 avenue Moliere, 67000 Strasbourg, France
He retired in July 2006 to become director of
cmrr. He received a bachelor's degree from SHSU in criminology and corrections and his Master of Public Administration with a criminal justice concentration from Texas A&M Corpus Christi.
