A novel CMOS first-order all-pass filter

Circuits Syst Signal Process

2009

In this paper, a voltage-mode (VM) topology for providing first-order allpass filter responses is suggested. The proposed circuit is composed of a smaller number of components when compared to earlier ones, as it employs only three CMOS transistors, a grounded capacitor which is advantageous in integrated circuit (IC) processes, and two resistors. Computer simulation results, using the SPICE program, are given to exhibit the performance. A second-order low-pass filter employing only grounded capacitors which are canonical in number is given as one of the applications of the presented non-inverting first-order all-pass filter topology.

“…2 can provide the non-inverting first-order allpass filter responses in (10), which can be ideally defined by the following equation:…”

Section: Description Of the Proposed Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel CMOS-Based Voltage-Mode First-Order Phase Shifter Employing a Grounded Capacitor

Circuits Syst Signal Process

2009

“…A literature survey shows that several first-order voltage-mode (VM) phase shifters have been reported [1,2,[4][5][6][7][8][9][10][12][13][14].…”

mentioning

confidence: 99%

High Input Impedance NMOS-based Phase Shifter with Minimum Number of Passive Elements

Mınaeı

Circuits Syst Signal Process

2011

In this paper, a new voltage-mode (VM) first-order phase shifter (all-pass filter) employing only four NMOS transistors and minimum number of passive elements (i.e. one resistor and one capacitor) is proposed. The proposed VM phase shifter has high input impedance and does not require passive element matching constraints. Moreover, since only two NMOS transistors are stacked between positive and negative supply voltages, the proposed circuit is suitable for low-voltage operation. Electronic tunability can be provided easily by replacing the employed resistor with an NMOS transistor operating in triode region. Simulation results based on 0.18 µm TSMC CMOS parameters with ±0.9 V supply voltages are given to demonstrate the performance of the proposed phase shifter.

“…It is a well known fact that an all-pass filter (phase shifter) topology like previously reported first-order signal processing units [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] finds wide , which is suitable for high frequency applications, contains three CMOS transistors, a floating resistor for biasing purpose and a large coupling capacitor for dc isolation of the load. The circuit reported in 12 is a square-rootdomain CM filter which needs two identical bias currents.…”

Section: Introductionmentioning

confidence: 99%

Realization of First-Order Current-Mode Filters With Low Number of Mos Transistors

Mınaeı

Herencsár

et al. 2013

J CIRCUIT SYST COMP

In this paper, a new current-mode (CM) circuit for realizing all of the first-order filter responses is suggested. The proposed configuration contains low number of components, only two NMOS transistors both operating in saturation region, two capacitors and two resistors. Major advantages of the presented circuit are low voltage, low noise and high linearity. The proposed filter circuit can simultaneously provide both inverting and non-inverting first-order low-pass, high-pass and all-pass filter responses. Computer simulation results achieved through SPICE tool and experimental results are given as examples to demonstrate performance and effectiveness of the proposed topology.