Design techniques for high intermediate frequency bandpass (sigma/delta) modulator.
| dc.contributor | Jose, Silva M. | |
| dc.creator | Kode, Praveena | |
| dc.date.accessioned | 2008-10-10T21:00:40Z | |
| dc.date.accessioned | 2017-04-07T19:54:04Z | |
| dc.date.available | 2008-10-10T21:00:40Z | |
| dc.date.available | 2017-04-07T19:54:04Z | |
| dc.date.created | 2008-08 | |
| dc.date.issued | 2008-10-10 | |
| dc.description.abstract | The focus of the present thesis is the circuit-level implementation of an excess loop delay compensation scheme which optimizes excess loop delay in Analog-to-Digital Converter(ADC) by using a programmable delay block and synchronizes the signal passing through Dynamic Element Matching block, used to mitigate mismatch effects of multi-bit Digital-to-Analog Converter(DAC). The proposed delay block has tuning range of T/10 to T/2 seconds, with a step size of T/30 seconds, where T is the time period (1.25 nanoseconds) of sampling signal (800 MHz) in high IF (200 MHz) Bandpass [sigma delta] ADC. The implementation details of the element rotation scheme used to calibrate the multi-bit DAC static error mismatch are also presented. Also presented is the design of high frequency highly linear Operational Transconductance Amplifier(OTA) targeted for continuous-time filters in a high resolution High Intermediate Frequency (200 MHz) Bandpass [sigma delta] ADC for Software Radio applications. Proposed OTA uses super source follower input stage to enhance its voltage-to-current conversion linearity. The design has been simulated using TSMC 0.18 ?m CMOS process. The OTA has small signal transconductance of 0.9 mA/V, IM3 below -79 dB (for 0.3 Vpp input), Signal-to-Noise Ratio of 82 dB and power consumption of 6.8 mW, when tested in unity gain configuration. | |
| dc.identifier.uri | http://hdl.handle.net/1969.1/86025 | |
| dc.language.iso | en_US | |
| dc.publisher | Texas A&M University | |
| dc.subject | LOOP DELAY | |
| dc.subject | OTA | |
| dc.title | Design techniques for high intermediate frequency bandpass (sigma/delta) modulator. | |
| dc.type | Book | |
| dc.type | Thesis |