A Low Power and High Resolution 2nd Order DT Sigma-Delta Modulator for Data Converters
E. Srinivas1, Lakkireddy Jhansi2, N. Sharath Kumar3
1E. Srinivas, Research Scholar, Jawaharlal Nehru Technological University, Hyderabad (Telangana), India.
2Lakkireddy Jhansi, M.Tech Student, Department of Electronics and Communication Engineering, Anurag Group of Institutions, Hyderabad (Telangana), India.
3N. Sharath Kumar, M.Tech Student, Department of Electronics and Communication Engineering, Anurag Group of Institutions, Hyderabad (Telangana), India.
Manuscript received on 24 September 2018 | Revised Manuscript received on 30 September 2018 | Manuscript published on 30 November 2018 | PP: 330-333 | Volume-7 Issue-4, November 2018 | Retrieval Number: E1854017519©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: A 2nd order low power and High Resolution discrete time Sigma-Delta modulator presented in this paper for Analog-to-Digital converters (ADC), is developed using CMOS technology. This paper is specifically designed through which it accepts an input signal of frequency 1 KHz, an over sampling ratio (OSR) ≤512 and sampling frequency up to 2MHZ for a second order Sigma-Delta modulator. It is put in to practice in a standard 0.18 µm (180nm) CMOS technology. The design of the sigma-Delta modulator and the simulation of it is done by using CADENCE tools. To form Sigma-Delta modulator this paper essentially elaborates integrator, summer, comparator, D-Latch and Digital-to-Analog (DAC) converters which are integrated together. The key component used in the design is CMOS Operational Amplifier, the OP-AMP open loop gain is 86.8dB, unity gain frequency 5.41 MHz and power consumption is 35.6microwatts. Finally using a ±1.8 v supply voltage a 2nd order Sigma-Delta modulator is realized.
Keywords: Analog-Digital Converters, Op-Amp, Operational Amplifier, Sigma-Delta Modulator
Scope of the Article: Low-power design