This paper describes Data-Weighted-Averaging (DWA) algorithms for multibit complex bandpass ∆ΣAD modulators with arbitrary signal bands. In most of bandpass ∆ΣAD modulators, their sampling frequency is chosen as four times of the center frequency of their signal band in order to simplify the following digital filter design. But with this relationship, their performance would be limited by the t...

In this decade, compact bandpass filters are essential components in microwave systems for passing desired signals and suppressing unwanted signals. Microstrip bandpass filter is rapidly going up in the design and fabrication in RF front-ends of wireless communication systems. The microstrip structure is well-known because of its light weight and simple design method. As knowing, the bandpass f...

Digital radio receivers must perform the analog-to-digital conversion of bandpass signals. For signals with small relative bandwidths, bandpass XA analog-to-digi ta l converters offer high signal-to-noise ratios at significantly lower sampling rates than are required for lowpass ZA converters, while still providing excellent linearity. A 4thorder bandpass ZA modulator implemented in a 3 pm CMOS...

This paper presents a Class-D power amplifier for bandpass pulse width modulated (BP-PWM) and bandpass deltasigma modulated (BP-DSM) signals at 20 MHz. A 1-bit 6-th order topology is used in the ∆Σ-modulator. Integral noise shaping is used in the generation of the bandpass pulse width modulated signal. A two sided pulse width modulation is used with a 6-bit 4th-order noise shaper. The push-pull...

The ability of narrow bandpass filters to discriminate wavelengths between closely-separated gas absorption lines is crucial in many areas of infrared spectroscopy. As improvements to the sensitivity of infrared detectors enables operation in uncontrolled high-temperature environments, this imposes demands on the explicit bandpass design to provide temperature-invariant behavior. The unique neg...

This paper presents a tunable bandpass filter based on the varactor-loaded composite rightand left-handed transmission line (CRLH-TL). The proposed filter is composed of one CRLH-TL unit cell, which corresponds to the third-order bandpass filter. The tunable bandpass filter is designed using only lumped-elements. The use of lumped elements saves space and lowers the fabrication cost. The size o...

In this paper, a simple method to obtain a notch in the ultra-wideband (UWB) bandpass filter is presented. UWB bandpass filter is designed using ground plane aperture technique. To reject the undesired wireless local area network (WLAN) signals, a complementary single split ring resonator (CSSRR) is placed under the coupled lines of the bandpass filter. The CSSRR has flat insertion loss and goo...

An adaptive pole-zero filter comprised of a bank of bandpass filters is presented. The bandpass filters permit the adaptive filter to be realized in a parallel form of first-order sections. Simple monitoring of the filter poles during adaptation is therefore possible so that stability can be ensured. This paper focuses on bandpass filters which are implemented by a frequency-sampling structure;...

Bandpass sampling holds much promise for the realisation of software radio receivers, particularly for mobile devices. Sampling at reduced rates eases many of the ADC requirements, and decreases power consumption, thus increasing battery lifetime, and overall receiver size. The need for very high performance programmable devices is also reduced. This paper demonstrates the importance of the ban...

This paper presents a technique for improving the SNR and resolution of complex bandpass ∆ΣADCs which are used for wireless communication systems such as cellular phone, wireless LAN and Bluetooth. Oversampling and noise-shaping are used to achieve high accuracy of a ∆ΣAD modulator. However when a multi-bit internal DAC is used inside a modulator, nonlinearities of the DAC are not noise-shaped ...