A 4th-Order Active-&lt;tex&gt;$G_m$&lt;/tex&gt;-RC Reconfigurable (UMTS/WLAN) Filter

D'Amico, S.; Giannini, Vito; Basçhirotto, A.

doi:10.1109/jssc.2006.873676

Cited by 127 publications

(59 citation statements)

References 16 publications

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“…For 17-and 8.5-MHz bandwidth settings, the FOM of the filters described here are 0.2 and 0.3 fJ. The FOM of the filters in [2] and [11] are lower, but these filters have a much broader transition band. The FOM of the filters presented here is better than those that have a comparably narrow transition band.…”

Section: Measured Resultsmentioning

confidence: 76%

“…Since the third-order distortion increases at 3 dB for a 1-dB increase in the input signal, it can be worked out that the SNR is equal to 2/3(IIP3 − N ) when the distortion is equal to noise (both the IIP3 and N are in decibels). 2 Where the integrated noise is not reported, it is calculated by multiplying the inband spectral density by the square root of the bandwidth. Because of the noise peaking near the band edge, this underestimates the noise to some extent.…”

Section: Measured Resultsmentioning

confidence: 99%

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A High-IIP3 Third-Order Elliptic Filter With Current-Efficient Feedforward-Compensated Opamps

Krishnapura

Agrawal

Singh

2011

IEEE Trans. Circuits Syst. II

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Abstract-A low-distortion active filter is realized using currentefficient feedforward-compensated operational amplifiers in the integrators and feedforward current injection in the summing amplifier. A third-order elliptic low-pass filter with two possible bandwidth settings of 17 and 8.5 MHz consumes 1.8 mW from a 1.8-V supply and occupies 0.17 mm 2 in a 0.18-μm CMOS process. The measured maximum signal-to-noise and distortion ratios at the two bandwidth settings are 50.5 and 52.5 dB, respectively. The corresponding third-order intermodulation intercept points (IIP3) are +28.2 and +30.8 dBm. Automatic tuning is used at the startup to counter process variations and set the bandwidth accurately.

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Section: Measured Resultsmentioning

confidence: 76%

Section: Measured Resultsmentioning

confidence: 99%

A High-IIP3 Third-Order Elliptic Filter With Current-Efficient Feedforward-Compensated Opamps

Krishnapura

Agrawal

Singh

2011

IEEE Trans. Circuits Syst. II

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“…The filter is composed by the cascade of two biquadratic cells, whose main performance are summarized in Table 5. Each biquadratic cell is implemented using the Active-G m -RC topology [16], where the Opamp unity gain bandwidth is used as filter transfer function parameter. With reference to the generic biquadratic cell, the low-pass transfer function is given by: …”

Section: V Filter Circuital Topologymentioning

confidence: 99%

“…The integrator is designed by using a single-Opamp topology, and the two biquadratic cells are implemented in Active-G m -RC configuration [16,18]. That allows to synthesize a complex poles pair using only one additional Opamp, comparing with the most popular 2nd-order Tow-Thomas biquad.…”

Section: Filter Transfer Functionmentioning

confidence: 99%

Continuous Time Analog Filters Design in Nanometerscale CMOS Technologies

Matteis

Baschirotto

2014

High-Performance AD and DA Converters, IC Design in Scaled Technologies, and Time-Domain Signal Processing

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Analog filters are widely used in several kinds of integrated mixedsignal systems, since they are intrinsically needed for in-band signal selection, out-of-band noise rejection and anti-aliasing for the A-to-D (D-to-A) conversion. CMOS technological scaling down has already entered in nm-range scenario, leading to severe degradation of some of the most important MOS device performance for analog design. Among them, lower V DD /V TH ratio (supply voltage and threshold voltage, respectively), higher power consumption, and transistor intrinsic gain decreasing. On the other side the increasing MOS transistor transconductance (g m ) and transition frequency (f T ) enables tens of GHz applications, which take advantage of cheaper and smart CMOS processes. Specific continuoustime analog filters will be presented in this chapter, with the aim to introduce novel circuital topologies or optimizations and techniques suitable to mitigate the severe issues present in sub-90 nm CMOS technological nodes, and at the same time to exploit the opportunity of higher technological scaling-down.

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“…The control switches are implemented as straight NMOS-PMOS transmission gates; this solution assures a lower on-resistance and a better linear behavior. Figure 1.12 is a schematic of the flexible baseband lowpass filter (LPF) based on an optimized cascade of active-G m -RC [18] and Rauch biquadratic sections. The combination of this two biquadratic cells is based on power and linearity considerations.…”

Section: Flexible Baseband Analog Circuitsmentioning

confidence: 99%

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A 4th-Order Active-<tex>$G_m$</tex>-RC Reconfigurable (UMTS/WLAN) Filter

Cited by 127 publications

References 16 publications

A High-IIP3 Third-Order Elliptic Filter With Current-Efficient Feedforward-Compensated Opamps

A High-IIP3 Third-Order Elliptic Filter With Current-Efficient Feedforward-Compensated Opamps

Continuous Time Analog Filters Design in Nanometerscale CMOS Technologies

Software-Defined Radio Front-Ends

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