MF8 4th-Order Switched Capacitor Bandpass Filter
ثبت نشده
چکیده
The MF8 consists of two second-order bandpass filter stages and an inverting operational amplifier. The two filter stages are identical and may be used as two tracking second-order bandpass filters, or cascaded to form a single fourth-order bandpass filter. The center frequency is controlled by an external clock for optimal accuracy, and may be set anywhere between 0.1 Hz and 20 kHz. The ratio of clock frequency to center frequency is programmable to 100:1 or 50:1. Two inputs are available for TTL or CMOS clock signals. The TTL input will accept logic levels referenced to either the negative power supply pin or the ground pin, allowing operation on single or split power supplies. The CMOS input is a Schmitt inverter which can be made to selfoscillate using an external resistor and capacitor.
منابع مشابه
LTC1059 - High Performance Switched Capacitor Universal Filter
1 1059fd ■ Sinewave Oscillators ■ Sweepable Bandpass/Notch Filters ■ Full Audio Frequency Filters ■ Tracking Filters ■ All Filter Parameters Guaranteed Over Temperature ■ Wide Center Frequency Range (0.1Hz to 40kHz) ■ Low Noise, Wide Dynamic Range ■ Guaranteed Operation for ±2.37V and ±5V Supply ■ Low Power Consumption ■ Guaranteed Clock-to-Center Frequency Accuracy of 0.8% ■ Guaranteed Low Off...
متن کاملA Very Low Voltage 9th Order Linear Phase Baseband Switched Capacitor Filter (RESEARCH NOTE)
A very low voltage 9th order linear phase baseband switched capacitor (SC) filter has been designed to be used as part of a cellular GSM (Global System Mobile) receiver. A Gaussian-to-6dB filter of the order of seven is chosen and a second order function is added to reduce the group delay variations around. The filter uses a fully differential topology to increase the dynamic range and reduce t...
متن کاملDESIGN PAFUMETERS FOR OUR SIXTH - ORDER BP IZA MODUUTOR Parameter
The traditional low-pass ZA analog-to-digital converter is extended to the bandpass case. For input signals with small relative bandwidths, bandpass !ZA converters offer high signal-to-noise ratios at significantly lower sampling rates tban are required for low-pass XA converters. A sixth-order single-ended switched-capacitor circuit, clocked at 3 MHz, is designed to convert bandpass signals ce...
متن کاملHigh-Selectivity Switched-Capacitor Bandpass Filter with Quasi-Continuous Quality Factor Tunability
This paper describes the design and implementation of a second-order switched-capacitor (SC) bandpass (BP) filter with very wide quality factor (Q) programmability range. The filter selectivity is digitally programmed by varying the effective sampling frequency of an SC branch, without modifying any capacitor value. The proposed approach allows a quasi-continuous Q-factor tunability avoiding, i...
متن کاملA Voltage-Mode Switched-Capacitor Bandpass ∆Σ Modulator
A novel fourth-order voltage-mode switched-capacitor bandpass ∆Σ modulator, using direct-charge-transfer pseudo-N-path resonators, is described. This modulator is insensitive to component mismatches and finite opamp bandwidth, and is also less sensitive to finite opamp gain than previous bandpass ∆Σ data converters. It is therefore suitable for high-speed communications applications.
متن کامل