-
[show abstract]
[hide abstract]
ABSTRACT: This paper describes the design of a high-transconductance, wide-band, temperature-insensitive bipolar differential voltage-to-current
converter, the transconductance of which is determined by a chosen degeneration resistor. Detailed illustrations of current
and voltage traces are included to clarify circuit operation. Comparison with previously published designs shows that this
converter provides better linearity, with very low temperature sensitivity and excellent transconductance predictability.
Simulation results show that the proposed circuit, with a nominal transconductance of 5mS, has a Total Harmonic Distortion
(THD) better than −70dB at 10MHz, with a degeneration resistor of 400 Ω over an input voltage range of 350mV for supply
voltages of ±2.5V. The analysis and simulation comparisons are in good agreement.
KeywordsTransconductance-Voltage-to-current converter-Total harmonic distortion-Global feedback-Emitter degeneration
Circuits Systems and Signal Processing 04/2012; 29(6):1123-1140. · 0.82 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: This paper describes the design of a DC voltage-to-current converter (V-I) which is unique in that, operating from a single positive supply rail, it produces an output current linearly related to an input voltage down to an input voltage of zero. Simulation results, presented for operation over a DC input range from zero to 100mV, are in very close agreement with those predicted by the theory presented.
Design and Technology of Integrated Systems in Nanoscale Era, 2008. DTIS 2008. 3rd International Conference on; 04/2008
-
[show abstract]
[hide abstract]
ABSTRACT: This paper describes a highly linear and low- distortion, bipolar differential voltage-to-current converter (V-I) circuit that can be used for a number of applications, such as the transconductance stage for mixer circuits and gm-c filter circuits. This circuit is capable of providing a wider linear range of operation and lower total harmonic distortion compared with the conventional emitter-degenerated emitter-coupled differential pair due to the global feed-back technique used. Simulation results show that this circuit can provide 30dB improvement in total harmonic distortion over an operating range from -0.5V to +0.5V. This circuit uses a supply voltage of plusmn2.5V and an emitter degeneration resistor of 600 Omega.
Design and Technology of Integrated Systems in Nanoscale Era, 2008. DTIS 2008. 3rd International Conference on; 04/2008
-
[show abstract]
[hide abstract]
ABSTRACT: This paper considers two schemes in which negative feedback is applied to a conventional emitter-coupled differential voltage-to-current converter circuit in order to achieve lower distortion. Representative circuits for each of these schemes together with simulated results for a given value of emitter-degeneration resistor are presented. It is possible to achieve a reduction in total harmonic distortion (THD) exceeding 20dB, for a peak-to-peak differential input voltage of 500mV, over that possible without this feedback.
Circuits and Systems, 2007. MWSCAS 2007. 50th Midwest Symposium on; 09/2007
-
[show abstract]
[hide abstract]
ABSTRACT: The use of two complementary emitter-followers, in which the collector currents are held effectively constant by feedback action, facilitates the design of a differential voltage- current converter capable of producing lower output signal distortion. The proposed circuit provides an extended linear operating range, and total harmonic distortion (THD) 20 dB better than that compared with an emitter-degenerated long- tailed pair circuit. Simulation results show that the THD is better than -70 dB for differential input signals up to 0.5 V at a test frequency of 1 MHz and supply voltage of plusmn5 V.
Research in Microelectronics and Electronics Conference, 2007. PRIME 2007. Ph.D.; 08/2007
-
[show abstract]
[hide abstract]
ABSTRACT: A symmetrical BJT voltage-follower is presented which combines low harmonic distortion and high slew rate. Unlike conventional class-AB voltage-followers the proposed design provides large signal swing, some plusmn4.5 V on a plusmn5 V power supply, as well as large positive and negative output currents for driving capacitive loads, resulting in high slew-rate capability. The circuit exhibits gain flatness of 0.1 dB at 728 MHz with an inductive behaviour coming in at higher frequencies. The operational range is -20degC to +100degC with a power consumption of 55 mW at room temperature.
Electronics, Circuits and Systems, 2006. ICECS '06. 13th IEEE International Conference on; 01/2007
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents a novel voltage-follower, implemented in bipolar technology, designed for operation up to 250 MHz. It features high input and low output impedances, low total harmonic distortion (THD) and low offset-voltage
Communications, Circuits and Systems Proceedings, 2006 International Conference on; 07/2006
-
[show abstract]
[hide abstract]
ABSTRACT: A novel proportional to absolute temperature (PTAT) current converter is presented. Output current gain ratios in excess of 50 are possible without the use of an operational amplifier. Simulation measurements show an output temperature coefficient within 15 ppm/°C of the reference current over the temperature range of -40 to +85°C.
Electronics Letters 05/2006; · 0.96 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: A novel temperature-independent direct current converter, the subject of a patent application number GB051623.8, is presented. Conversion ratios from less than unity to in excess of 50 are possible. Simulation measurements show an output temperature coefficient as low as 16 ppm/°C over the temperature range -40 to +85°C.
Electronics Letters 12/2005; · 0.96 Impact Factor
