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Mali, Dr. M. B.
- Design of High Gain Bandwidth CMOS Operational Amplifier
Authors
Source
Digital Signal Processing, Vol 10, No 7 (2018), Pagination: 116-119Abstract
Operational amplifier plays to be the fundamental concrete block of analog CMOS VLSI. Communication systems are demanding high Gain- Bandwidth (GBW) operational amplifier. Real time demands of communication systems are stringent. This opamp is presented to outplay these real time stringent constraints and plays vital role in communication applications. Single ended differential amplifiers have limitations on attaining high Gain-Bandwidth factor. So, to get over limitation of gain bandwidth, balanced in balanced out topology is presented for this operational amplifier design. To attain desired Gain-Bandwidth two NMOS balanced in balanced out stages are cascaded. Common Mode (CM) voltage of each NMOS stage is stabilized by Common Mode Feedback (CMFB) amplifier to each stage. This op-amp loaded with 100 fF capacitance achieves 2.37 GHz unity Gain-Bandwidth with 45.44° phase margin along with 57.72 dB DC gain.
Keywords
Balanced in Balanced Out, Baseband Signal Processing, CMFB Amplifier, Latency, Operational Amplifier, Unity Gain Bandwidth.- Design of Differential Input High Gain Op-Amp Using 180 nm Technology
Authors
Source
Digital Signal Processing, Vol 10, No 7 (2018), Pagination: 120-123Abstract
Operational amplifier is a building block of an analog electronic. Now more number of application are using in their product. A Two stage differential amplifier Dual input and single ended output opamp is designed for high gain, high bandwidth, and for high noise immunity. This design have DC gain of 70dB, Phase Margin=450, ICMR (+) =1.6v, ICMR (-) =0.8v, load capacitance ≤300µw. Vdd =1.8v. These specifications designed in the cadence virtuoso in 180nm technology.