A novel microprocessor-controlled active-R multifunction network: design of programmable filter, oscillator, and FSK/PSK wave generator

Author

Sanyal, S.K. ; Sarker, U.C. ; Nandi, R.

Author_Institution

Dept. of Electron. & Telecommun. Eng., Jadavpur Univ., Calcutta, India

Volume

37

Issue

9

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

1085

Lastpage

1091

Abstract

A two-operational amplifier (OA) active-R network with multifilter/oscillator functional capability is described. Analysis indicates the availability of bandpass (BP), low-pass (LP), band-reject (BR), all-pass (AP), and sinusoidal oscillator functions at extended frequency range with low sensitivity. Design equations and expressions for frequency stability and sensitivity are derived. Designs for both continuous and digitally programmable control of the network parameters using appropriate switched resistors have been derived and verified experimentally. The scanning of a typical band (50-200 kHz with μA/LM 741 and 200-1000 kHz with LF 356 OAs) at certain programmable center frequencies has been verified experimentally while setting Q=10 with an appropriate resistor switching sequence generated by the microprocessor

Keywords

active filters; frequency shift keying; frequency stability; oscillators; phase shift keying; switched networks; 200 to 1000 kHz; 50 to 200 kHz; FSK/PSK wave generator; LF 356; LM 741; active-R network; all-pass; band-reject; bandpass; digitally programmable control; frequency stability; low-pass; microprocessor-controlled active-R multifunction network; network parameters; programmable center frequencies; programmable filter; sensitivity; sinusoidal oscillator functions; switched resistors; Availability; Bandwidth; Equations; Filters; Frequency shift keying; Log periodic antennas; Oscillators; Phase shift keying; Resistors; Switches;

fLanguage

English

Journal_Title

Circuits and Systems, IEEE Transactions on

Publisher

ieee

ISSN

0098-4094

Type

jour

DOI

10.1109/31.57597

Filename

57597