An ultra-low power hybrid 2nd order feed forward ΔΣ modulator design for implantable medical devices

Laouej, Dalila; Daoud, Houda; Loulou, Mourad

doi:10.1007/s10470-021-01894-z

Cited by 4 publications

(1 citation statement)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The advantage of this unit differential pair is that it is convenient to design the position of poles. The unit gain bandwidth is positively related to the product of DC gain and pole frequency [19].…”

Section: Design Of G M2a G M3a and G M1bmentioning

confidence: 99%

Design of a Multistage Feed-forward Operational Amplifier for High- Speed Continuous-Time ΣΔ ADCs

Zhang

Chang

et al. 2023

Preprint

View full text Add to dashboard Cite

This paper presents a high-gain, high-frequency, bandpass operational amplifier with feed-forward compensation. It is designed to meet the requirements of a continuous time (CT) bandpass sigma delta (Σ∆) modulator with multi-GHz sampling frequency. The circuit consists of a main path composed of four stages of transconductance amplifiers and two feed-forward paths, and a common-mode feedback circuit is added to each stage to stabilize the DC operating point. The feed-forward compensation solves the problem that Miller compensation fails at high frequencies. The position of zeros and poles is adjusted by two feed-forward paths to improve the in-band phase margin. Low frequency and in-band noise are suppressed by adjusting the transfer function, and power consumption is reduced by current multiplexing. With a parallel load of 2 pF and 500 Ω, the post netlist simulation shows that this design achieves a gain of more than 45 dB in the bandwidth range of 10 kHz to 400 MHz, a unit gain frequency of 16.48 GHz and a phase margin of 66 ° under the conditions of a 1.2 V supply voltage. The maximum input equivalent noise is 8.97 \({\mu }\text{V}/\sqrt{\text{H}\text{z}}\) with a quiescent power dissipation of 35.3 mW.

show abstract

Section: Design Of G M2a G M3a and G M1bmentioning

confidence: 99%