The Biquad: Part I-Some practical design considerations

Thomas, L.

doi:10.1109/tct.1971.1083277

Cited by 212 publications

(30 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For , the input resistances of the real circuit is the same as of the imaginary circuit. 2 Under this condition, the amplitude of is the same as that of . Fig.…”

Section: B Imaginary Resistormentioning

confidence: 96%

See 1 more Smart Citation

Synthesis of a Passive Complex Filter Using Transformers

Shouno

Ishibashi

2008

IEEE Trans. Circuits Syst. I

View full text Add to dashboard Cite

Abstract-In this paper, the synthesis of a passive complex filter has been described. First, a normalized real coefficient filter is transformed into a complex coefficient filter, which includes imaginary-valued resistors by using a proposed frequency transformation. Second, a complex filter using passive elements is presented. The proposed circuit consists of terminating resistors, capacitors, and transformers with finite self-inductances and coupling coefficients equal to or less than unity. A third-order complex Chebyshev bandpass filter is designed using practical passive elements, and its frequency response is measured. It is shown that the experimental circuit exhibits bandpass characteristics (90-110 kHz) and an image rejection of 53 dB.

show abstract

“…For , the input resistances of the real circuit is the same as of the imaginary circuit. 2 Under this condition, the amplitude of is the same as that of . Fig.…”

Section: B Imaginary Resistormentioning

confidence: 96%

“…To solve this problem, many RC-active filters have been proposed [1]- [3]. An RC-active filter has a cascade configuration of the second-order sections such as the Sallen-Key circuit [1], Biquad circuit [2], and so on. This structure is employed because the number of active elements in it is relatively small.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Passive Complex Filter Using Transformers

Shouno

Ishibashi

2008

IEEE Trans. Circuits Syst. I

View full text Add to dashboard Cite

show abstract

“…The Tow-Thomas biquad [17][18][19] of Fig. 1 is an active-RC topology used to realize both lowpass and bandpass biquadratic filtering functions.…”

Section: Tow-thomas Biquadmentioning

confidence: 99%

Fractional-step Tow-Thomas biquad filters

Freeborn

Maundy

Elwakil

2012

NOLTA

View full text Add to dashboard Cite

Abstract:In this paper we propose the use of fractional capacitors in the Tow-Thomas biquad to realize both fractional lowpass and asymmetric bandpass filters of order 0 < α 1 + α 2 ≤ 2, where α 1 and α 2 are the orders of the fractional capacitors and 0 < α 1,2 ≤ 1. We show how these filters can be designed using an integer-order transfer function approximation of the fractional capacitors. MATLAB and PSPICE simulations of first order fractional-step low and bandpass filters of order 1.1, 1.5, and 1.9 are given as examples. Experimental results of fractional low pass filters of order 1.5 implemented with silicon-fabricated fractional capacitors verify the operation of the fractional Tow-Thomas biquad.

show abstract

“…For high linearity, the sixth-order active RC LPF shown in Fig. 3 is proposed [8], [9]. The active RC LPF shows higher linearity characteristics than the G m -C LPF, but its wideband characteristics are not sufficient.…”

Section: Circuit Designmentioning

confidence: 99%

A 0.13μm CMOS UWB RF Transmitter with an On-Chip T/R Switch

Kim¹,

Duong²,

Lee³

et al. 2008

ETRI Journal

View full text Add to dashboard Cite

This paper presents a fully integrated 0.13 μm CMOS MB-OFDM UWB transmitter chain (mode 1). The proposed transmitter consists of a low-pass filter, a variable gain amplifier, a voltage-to-current converter, an I/Q up-mixer, a differential-to-single-ended converter, a driver amplifier, and a transmit/receive (T/R) switch. The proposed T/R switch shows an insertion loss of less than 1.5 dB and a Tx/Rx port isolation of more than 27 dB over a 3 GHz to 5 GHz frequency range. All RF/analog circuits have been designed to achieve high linearity and wide bandwidth. The proposed transmitter is implemented using IBM 0.13 μm CMOS technology. The fabricated transmitter shows a -3 dB bandwidth of 550 MHz at each sub-band center frequency with gain flatness less than 1.5 dB. It also shows a power gain of 0.5 dB, a maximum output power level of 0 dBm, and output IP3 of +9.3 dBm. It consumes a total of 54 mA from a 1.5 V supply.

show abstract

The Biquad: Part I-Some practical design considerations

Cited by 212 publications

References 3 publications

Synthesis of a Passive Complex Filter Using Transformers

Synthesis of a Passive Complex Filter Using Transformers

Fractional-step Tow-Thomas biquad filters

A 0.13μm CMOS UWB RF Transmitter with an On-Chip T/R Switch

Contact Info

Product

Resources

About