A gyrator‐rc double‐tuned band‐pass amplifier a step towards the integrated I.F. amplifier of a broadcast receiver

Abstract

SUMMARYA gyrator-RC twoport has the response of a conventional double-tuned transformer-coupled intermediate frequency amplifier stage. It uses two grounded gyrators and a II of capacitors to replace the transformer, and is designed for low sensitivity. Stages can be stagger-tuned for a prescribed response. Suitable novel gyrator circuits are developed and measured. Measurements of the gyrator-RC double-tuned circuits give the known double-tuned response with critical, over-and under-critical coupling. A receiver circuit is suggested from the mixer to the detector in view of the gain, selectivity, A.G.C., swing and stability requirements. This circuit has to be reconsidered and possibly modified in later work for the purpose of integration.

Design of a high performance mutually coupled circuit

“…This topology was used to build and simulate all MCCs to be compared. The plus-type CCII is obtained from this DVCC, simply by removing the first long-tail pair (M 1 Performance properties of the DVCC, CCII? and CCII-obtained via simulations are summarized in Table 2.…”

“…In [1], two bipolar-transistor-based gyrators are capacitively coupled, but the coupling coefficient is not easily adjustable. Another bipolar-transistor-based mutually coupled circuit (MCC) avails easy tuning of the coupling coefficient [2].…”

“…The idea of using gyrator-based double-tuned circuits in implementation of integrated IF amplifiers is not new [1]. In [1], two bipolar-transistor-based gyrators are capacitively coupled, but the coupling coefficient is not easily adjustable.…”

“…Another bipolar-transistor-based mutually coupled circuit (MCC) avails easy tuning of the coupling coefficient [2]. These two circuits [1,2] suffer from usage of many passive components. MCC realizations based on basic building blocks, such as opamps, operational transconductance amplifiers (OTAs) and current conveyors (CCs), have also been reported [3][4][5][6][7][8].…”