By Anton Bakker (auth.), J. H. Huijsing, Michiel Steyaert, Arthur van Roermund (eds.)
Analog Circuit Design comprises the contribution of 18 specialists from the thirteenth foreign Workshop on Advances in Analog Circuit layout. it's quantity thirteen within the profitable sequence of Analog Circuit Design.
It presents 18 very good overviews of analog circuit layout in: Sensor and Actuator Interfaces, built-in High-Voltage Electronics and tool administration, and Low-Power and High-Resolution ADC’s.
Analog Circuit Design is a vital reference resource for analog circuits designers and researchers wishing to maintain abreast with the most recent advancements within the box. the educational insurance additionally makes it appropriate to be used in a sophisticated layout course.
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Extra resources for Analog Circuit Design: Sensor and Actuator Interface Electronics, Integrated High-Voltage Electronics and Power Management, Low-Power and High-Resolution ADC’s
5kHz, and the chopping frequency is 15kHz. Figure 23 shows the low-frequency noise spectrum: the noise at 1kHz is ab out 20nV/"Hz, which compares well against autozeroed op-amps which typically exhibit 70nV/"Hz or more. The maximum offset is specified at IOIlV. Figure 22: DC 10 100kHz noise speclrum Figure 23: DC 1020kHz noise speclrum 40 10. Summary The use of autozeroing or chopping or both have allowed op-amps to be manufactured with offsets lower than 101lV. Since the offset is continuously corrected, the low offset is maintained over time, over temperature, and over input signal voltage.
Gm is the transconductance of the amplifier, ro is the output resistance of the amplifier, and Vos is the offset of the amplifier. V1+ and V1_ are the input signals, and Vo is the output signal. To reduce the amplifier offset, a trim current (ITRIM) is added. J H. Huijsingel al. ), Analog Circuit Design, 23-41. © 2004 Kluwer Academic Publishers. 23 24 Vos Vo >-----~ Figure 1: Phase 1 0/ manual autozeroing VI+o--t + VI_o----I Figure 2: Phase 2 0/ manual autozeroing In phase 1 (Figure 1), the inputs of the amplifier are connected together.
13 shows an example a gm-ratio amplifier [17, 18], where the gain is given by A gm 2 V-gm /(1 + ß6 ) 6 4ß7 (1) This amplifier is only suitable for small input signals. The input swing is determined by the linear input range of the differential stage. 5 for the same performance) can be achieved by operating the transistors in weak inversion, where the gain is proportional to the ratio of the bias currents . 2 Analog-To-Digital Converters (ADCs) A general discussion of ADCs would exceed the scope of this article.
Analog Circuit Design: Sensor and Actuator Interface Electronics, Integrated High-Voltage Electronics and Power Management, Low-Power and High-Resolution ADC’s by Anton Bakker (auth.), J. H. Huijsing, Michiel Steyaert, Arthur van Roermund (eds.)