Rauscharme Verstärkerschaltung

Details

Veröffentlichungs-Nr.

EP3193446

Aktenzeichen

EP17150596

Anmeldetag

8. Januar 2017

Veröffentlichung

23. Oktober 2019

Erteilung

23. Oktober 2019

Rechtsraum

EP

IPC

H03F3/393H03F3/45H03F3/00H03F3/387G01R33/07

Abstract

A semiconductor circuit (200) comprising an input block having a first chopper (CH1) providing a chopped voltage signal (Vin_ch), a first transconductance (G1) converting said chopped voltage signal into a chopped current signal (I_ch), a second chopper (CH2) providing a demodulated current signal (I_demod), a current integrator (CI1) having an integrating capacitor (Cint) providing a continuous-time signal (Vct), a first feedback path comprising: a sample-and-hold block and a first feedback block (G2), the first feedback path providing a proportional feedback signal (Vfb, Ifb) upstream of the current integrator (CI1). The amplification factor is at least 2. Charge stored on the integrating capacitor (Cint) at the beginning of a sample period is linearly removed during one single sampling period (Ts). Each chopper operates at a chopping frequency (fc). The sample-and-hold-block operates at a sampling frequency (fs) equal to an integer (N) times the chopping frequency (fc).

Anmelder

Firma

Melexis Technologies SA

Land

🇨🇭 Schweiz

Fachgebiete