Low sensitivity single-ended-input OTA and grounded capacitor elliptic filter structure with the minimum components

After an innovative algebraic decomposition of a transfer function, a current-mode odd-order operational transconductance amplifier and capacitor (OTA-C) elliptic filter structure is proposed with the following advantages: (i) all single-ended-input OTAs; (ii) all grounded capacitors; (iii) the minimum of active and passive components; (iv) one grounded capacitor at each internal node; (v) low sensitivities. Hspice simulation with a 0.35 μm process for a current-mode third-order OTA-C elliptic low pass filter, employing four single-ended-input OTAs and three grounded capacitors, validates the theoretical predictions.