2-10 MHz programmable continuous-time 0.05 degrees equiripple linear phase filter

Veirman, G.A. De; Yamasaki, R.G.

doi:10.1109/cicc.1991.163998

Cited by 2 publications

(2 citation statements)

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“…In the design of linear or equiripple phase lowpass filters for disk-drive read channels, an amplitude equalization technique is required for pulse slimming, which improves pulse detection and increases disk writedensity [1]. The technique commonly used for monolithic realization of these circuits employs continuoustime filters built with operational transconductance amplifiers (OTAs) and capacitors, gm-C filters.…”

Section: Introductionmentioning

confidence: 99%

“…The method for equalizing the filter transfer function (a gain boost) proposed in [1] is to lift two capacitors off ground and to feed the signal from the input of the biquad forward to the lifted nodes through an inverting variable-gain voltage amplifier. These designs proved to be reliable for the active filter synthesis in the range up to a few tens of megahertz, but special care must be given to the design of the voltage amplifier.…”

Section: Introductionmentioning

confidence: 99%

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A current-mode biquadratic amplitude equalizer

Wyszynski

Schaumann

1993

Analog Integr Circ Sig Process

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Abstract. A boost biquad transfer function with two symmetrical zeros on the real axis is derived; it provides a technique for amplitude equalization with a second-order continuous-time gm-C section using current injection. The synthesis procedure yields a differential boost biquad consisting of three double-input OTAs and a single-input high-gm boost OTA. SPICE simulations show that for boost gain up to 20 dB the phase of the biquad is essentially unaffected. The presented technique is found suitable for amplitude equalization of disk-drive read channels operating in the range of 100 MHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%