First-Order All-Pass Filter Canonical in the Number of Resistors and Capacitors Employing a Single DDCC

Abstract

In this work, a voltage-mode canonical first-order all-pass filter is presented. The filter contains only a single resistor, a single capacitor, and a single differential difference current conveyor (DDCC). No passive component-matching constraints are required. A complementary metal oxide semiconductor CMOS implementation of a DDCC is given to simulate the proposed circuit with a Spice simulation program whose results illustrate the high performance of the circuit.

High input impedance voltage‐mode first‐order all‐pass sections

“…These transfer gains, though taken to be real are actually frequency dependent, with a first-order pole. Assuming them unity at working frequency is quite justifiable, as the pole actually occurs at a very high frequency, dependent on the device parameters and the technology used [15,18]. This has been further confirmed during the extensive simulation carried out on DVCC.…”

CDDITA-Based Voltage-Mode First Order All Pass Filter Configuration

“…It finds applications in realizing high selectivity active bandpass filters, delay equalizers and quadrature oscillators [1] [2]. Several voltage mode voltage-mode first-order allpass filter configurations employing different active building blocks (ABBs) such as, current conveyors (CCIIs) [3]- [9], Operational Transconductance Amplifiers (OTAs) [10] [11], current controlled current conveyors (CCCIIs) [12]- [14], differential voltage current conveyor (DVCC) [15]- [17], differential difference current conveyors (DDCCs) [18]- [20], current differencing buffered amplifier (CDBA) [21]- [23], operational transresis-tance amplifiers (OTRAs) [24]- [26], current controlled current differencing transconductance amplifiers (CCCDTA) [27], universal voltage conveyor [28] and Fully Balanced Voltage Differencing Buffered Amplifier (FBVDBA) [29] have been reported in literature but unfortunately, these proposed configurations suffer from one or more of the following drawbacks: i) use of excessive (more than one) number of ABBs [6] [29].…”

Unity/Variable-gain Voltage-mode/Current-mode First-order All-pass Filters Using Single Dual-X Second-generation Current Conveyor

“…Also, very simple VM first-order all-pass filters using one differential difference current conveyor (DDCC), one grounded capacitor and one floating resistor were presented in [19] and [20], but their input impedances depend on the values of the employed passive elements. Similarly, a single DDCC-based allpass filter with a floating capacitor and grounded resistor was presented in [21]. However, the input impedance of this circuit is also frequency-dependent.…”