Switched-capacitor gain stage with reduced sensitivity to finite amplifier gain and offset voltage

1986 ◽  
Vol 22 (24) ◽  
pp. 1281 ◽  
Author(s):  
L.E. Larson ◽  
G.C. Temes
Keyword(s):  
Switched Capacitor ◽  
Offset Voltage ◽  
Amplifier Gain ◽  
Gain Stage

scholarly journals Right-direct (BI) type wide bandpass SC ladder filter with compensation for finite amplifier gain and offset voltage

2008 ◽  
Vol 21 (2) ◽  
pp. 233-241
Author(s):  
Nikolay Radev ◽  
Kantcho Ivanov ◽  
Kalin Stanchev
Keyword(s):  
Sixth Order ◽  
Operational Amplifiers ◽  
Switched Capacitor ◽  
Offset Voltage ◽  
Op Amps ◽  
Dc Gain ◽  
Amplifier Gain

In this paper gain- and offset-compensated (GOC) modification of a sixth-order right-direct (BI) type wide bandpass switched-capacitor (SC) ladder filter is proposed. It is based on the use of simple and fast operational amplifiers (op amps) with low but precisely known and stable dc gain A. At first, the conventional integrators in the filter are replaced with GOC integrators and the unswitched capacitors in the capacitive loops are split into two capacitors. Subsequently, the nominal op amps gain value A0 is taking into account in the capacitance sizing of some appropriately chosen capacitors. .

scholarly journals Calibration of the passive cavity aerosol spectrometer probe for airborne determination of the size distribution

2013 ◽  
Vol 6 (3) ◽  
pp. 4123-4152 ◽  
Author(s):  
Y. Cai ◽  
J. R. Snider ◽  
P. Wechsler
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Scattered Light ◽  
Particle Diameter ◽  
Polystyrene Latex ◽  
Calibration Methods ◽  
Research Aircraft ◽  
Amplifier Gain ◽  
Gain Stage

Abstract. This work describes calibration methods for the particle sizing and particle concentration systems of the passive cavity aerosol spectrometer probe (PCASP). Laboratory calibrations conducted over six years, in support of the deployment of a PCASP on a cloud physics research aircraft, are analyzed. Instead of using the many calibration sizes recommended by the PCASP manufacturer, a relationship between particle diameter and scattered light intensity is established using three sizes of mobility-selected polystyrene latex particles, one for each amplifier gain stage. In addition, studies of two factors influencing the PCASP's determination of the particle size distribution – amplifier baseline and particle shape – are conducted. It is shown that the PCASP-derived size distribution is sensitive to adjustments of the sizing system's baseline voltage, and that for aggregate spheres, a PCASP-derived particle size and a sphere-equivalent particle size agree within uncertainty dictated by the PCASP's sizing resolution. Robust determination of aerosol concentration, and size distribution, also require calibration of the PCASP's aerosol flowrate sensor. Sensor calibrations, calibration drift, and the sensor's non-linear response are documented.

Cascade delta-sigma modulator with pseudo-differential comparator-based switched-capacitor gain stage

2007 ◽  
Vol 51 (3) ◽  
pp. 201-206 ◽  
Author(s):  
Dusan Prelog ◽  
Massoud Momeni ◽  
Bogomir Horvat ◽  
Manfred Glesner
Keyword(s):  
Switched Capacitor ◽  
Delta Sigma Modulator ◽  
Delta Sigma ◽  
Gain Stage

scholarly journals A comparative analysis of two gain- and offset-compensated switched-capacitor integrators

2002 ◽  
Vol 15 (2) ◽  
pp. 295-305
Author(s):  
Nikolay Radev ◽  
Kantcho Ivanov
Keyword(s):  
High Performance ◽  
Building Blocks ◽  
Switched Capacitor ◽  
Central Frequency ◽  
High Q ◽  
Offset Voltage ◽  
Dc Gain ◽  
Band Pass ◽  
Analytical Expressions ◽  
The Ideal

Two high-performance switched-capacitor (SC) integrators which use different approaches for the compensation of the operational amplifier finite dc gain and offset voltage are considered. Analytical expressions for the gain, phase and offset voltage errors of the Baschirotto-90 integrator are derived and compared with the corresponding errors of the Shafeeu-91 integrator. Both the integrators are used as building blocks of a high-Q band pass SC biquad. The resultant filters are compared in terms of the percent deviations from the ideal case of the central frequency and the quality factor. Subsequently, the slight shift in the frequency response of the biquad with Shafeeu-91 integrator is eliminated by modifying the values of two capacitors .

A New Sub-1 Volt 17ppm/°C Offset-Insensitive Resistorless Switched-Capacitor Bandgap Voltage Reference

2020 ◽  
pp. 2150029
Author(s):  
Emad Ebrahimi ◽  
Maliheh Arabnasery
Keyword(s):  
Process Variations ◽  
Voltage Divider ◽  
Cmos Technology ◽  
Reference Voltage ◽  
Cmos Process ◽  
Switched Capacitor ◽  
Voltage Reference ◽  
Op Amp ◽  
Offset Voltage ◽  
Bandgap Voltage Reference

A new PVT compensated voltage reference is presented by using switched-capacitor (S.C.) technique. In the proposed bandgap voltage reference (BGR), a p–n junction is biased with different currents during two different phases and required PTAT and CTAT voltages generated and held by two capacitors. Using a capacitive voltage divider, the PTAT voltage is weighted such that the sub-1V bandgap voltage is achievable. In order to cancel the effect of op-amp offset and to relax the design of op-amp, the offset voltage of the op-amp is sampled by a capacitor during a specified phase and inversely is added to the final bandgap voltage in next phase. The analysis of the proposed S.C. BGR is supplemented by simulation of a 0.5-V BGR with 28[Formula: see text][Formula: see text][Formula: see text]W power consumption in a standard 0.18[Formula: see text][Formula: see text][Formula: see text]m CMOS technology. Simulation results show that the average temperature coefficient of the S.C. BGR is 17[Formula: see text]ppm/∘C and it is robust against the process variations. Applying an arbitrary 100-mV op-amp offset results in a lower than 1.1[Formula: see text]mV deviation in generated reference voltage. Due to the better matching of MIM capacitors in CMOS process (rather than resistors used in conventional BGR) the proposed S.C. bandgap provides good accuracy without any post trimming. Monte–Carlo analysis shows that [Formula: see text]/[Formula: see text] of the generated reference voltage is as low as 0.7%. The sensitivity of the proposed BGR to supply variation is also less than 1%/V.

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