Fast on-chip tuning circuit for active RC filters using the SAR scheme

Cho, Youngjoo; Lim, Jinup; Jung, Kyungsoo; Park, Jong-Min; Yang, Haoran; Cha, Seung-Tae; Choi, Joongho

doi:10.1109/mwscas.2005.1594403

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…According to Equation (11), the filter cutoff frequency can be set to different values by changing the tuning bits of BitR<N -1:0> and BitC<M -1:0>.…”

Section: The Architecture Of the Active-g M -Rc Biquadratic Cellmentioning

confidence: 99%

“…Now the filter cutoff frequency is determined by the absolute value of resistors and capacitors shown in Equation (11) which cannot be well controlled in an integrated technology. In the worst condition, the filter cutoff frequency can have a variation of more than 50% due to the variation of passive components with process, supply voltage, operating temperature and aging.…”

Section: Architecture Of the Frequency Tuning Circuitmentioning

confidence: 99%

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A low power wide tuning range baseband filter for multistandard transceivers

Geng

2015

J. Semicond.

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This paper presents the design and implementation of a low power wide tuning range baseband filter with an accurate on-chip tuning circuit for reconfigurable multistandard wireless transceivers. The realized low pass filter (LPF) is a six-order Butterworth type by cascading three stage active-Gm-RC biquadratic cells. A modified linearization technique is used to improve the filter linearity performance at low power consumption. A new process-independent transconductor matching circuit and a new frequency tuning circuit with frequency compensation are proposed to achieve a high precision filter frequency response. The proposed LPF is realized in a 130 nm standard CMOS technology. The measured results show that the LPF exhibits a high bandwidth programmability from 0.1 to 25 MHz with a tuning frequency error less than 2.68% over the wide tuning range. The power consumption is scalable, ranging from 0.52 to 5.25 mA, from a 1.2 V power supply while achieving a 26.3 dBm in-band IIP3.

show abstract

“…According to Equation (11), the filter cutoff frequency can be set to different values by changing the tuning bits of BitR<N -1:0> and BitC<M -1:0>.…”

Section: The Architecture Of the Active-g M -Rc Biquadratic Cellmentioning

confidence: 99%

Section: Architecture Of the Frequency Tuning Circuitmentioning

confidence: 99%

A low power wide tuning range baseband filter for multistandard transceivers

Geng

2015

J. Semicond.

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show abstract

“…The current is accurately mirrored to charge the capacitor bank and this realizes the function of an integrator. The output voltage of an integrator can be expressed as After every comparison, the signal Clk discharge will discharge the integrator voltage on the capacitor bank, while Clk charge gives the beginning signal to charge the capacitor bank when a new tuning code has been generated [4,5] .…”

Section: Automatic Frequency Tuning For Filtersmentioning

confidence: 99%

A low power high linearity baseband for a direct conversation CMMB tuner

Fang

Yin

et al. 2009

J. Semicond.

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An analog baseband circuit made in a 0.35-μm SiGe BiCMOS process is presented for China Multimedia Mobile Broadcasting (CMMB) direct conversion receivers. A high linearity 8th-order Chebyshev low pass filter (LPF) with accurate calibration system is used. Measurement results show that the filter provides 0.5-dB passband ripple, 4% bandwidth accuracy, and −35-dB attenuation at 6 MHz with a cutoff frequency of 4 MHz. The current steering type variable gain amplifier (VGA) achieves more than 40-dB gain range with excellent temperature compensation. This tuner baseband achieves an OIP3 of 25.5 dBm, dissipates 16.4 mA under a 2.8-V supply and occupies 1.1 mm2 of die size.

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“…3 Where n is the multiplicity ratio of Q5 to Q6. Then with equation 1 and 2, the gain coefficient can be independent of temperature variation.…”

Section: Figure 1 Block Diagram Of the Cmmb Basebandmentioning

confidence: 99%

“…In order to achieve the high-precision filtering operation, the accurate absolute values of resistors and capacitors must be realized during operation. Fig.6 shows the block diagram of the general 5-bit tuning circuit for active-RC filters [3] [4]. The tenability of frequency response is achieved by arranging active binary-weighted capacitive elements in digitally programmable arrays.…”

Section: Bb Filtermentioning

confidence: 99%