CMOS digitally programmable filter for multi-standard wireless receivers

This paper presents a novel mixed mode universal filter configuration capable of working in voltage and transimpedance mode. The proposed single filter configuration can be reconfigured digitally to realize all the five second order filter functions (types) at single output port. Other salient features of proposed configuration include independently programmable filter parameters, full cascadability, and low sensitivity figure. However, all these features are provided at the cost of quite large number of active elements. It needs three digitally programmable current feedback amplifiers and three digitally programmable current conveyors. Use of six active elements is justified by introducing three additional reduced hardware mixed mode universal filter configurations and its comparison with reported filters.

Download Full-text

A CMOS digitally programmable filter technique for VLSI applications

Analog Integrated Circuits and Signal Processing ◽

10.1007/s10470-008-9154-0 ◽

2008 ◽

Vol 55 (2) ◽

pp. 177-187 ◽

Cited By ~ 11

Author(s):

Hussain Abdullah Alzaher

Keyword(s):

Filter Technique ◽

Programmable Filter ◽

Digitally Programmable

Download Full-text

Four-Input One-Output Voltage-Mode Universal Filter Using Simple OTAs

Journal of Circuits System and Computers ◽

10.1142/s0218126619500786 ◽

2019 ◽

Vol 28 (05) ◽

pp. 1950078 ◽

Cited By ~ 2

Author(s):

Montree Kumngern ◽

Pichai Suksaibul ◽

Fabian Khateb

Keyword(s):

Integrated Circuit ◽

Pass Band ◽

Cmos Process ◽

Passive Component ◽

Universal Filter ◽

Voltage Mode ◽

Programmable Filter ◽

Digitally Programmable ◽

Low Pass ◽

Electronically Tunable

This paper presents a new electronically tunable voltage-mode universal filter with four-input one-output employing six simple operational transconductance amplifiers (OTAs), two grounded capacitors and two MOS resistors. The use of grounded passive components is beneficial for integrated circuit implementation. The proposed filter can realize low-pass, band-pass, high-pass, band-stop and all-pass filtering functions without active and passive component-matching conditions and inverting-type input signals requirements. The natural frequency and quality factor can be tuned independently and electronically by adjusting the bias currents. The voltage-mode filter offers the features of high-input impedance and low active and passive sensitivities. The characteristics of the proposed universal filter are verified using PSPICE simulators through 0.35[Formula: see text][Formula: see text]m CMOS process. Experimental results are used to confirm the workability of proposed circuit through LM13600 commercially available OTAs. Also a digitally programmable filter is shown to confirm the advantage of multiple-input universal filter.

Download Full-text