Purpose The purpose of this paper is to design a voltage reference circuit for current source of radio frequency integrated circuit blocks. The voltage reference circuit is called voltage for current source VCS.Designmethodologyapproach The circuit concept is discussed. A voltagecontrolled oscillator VCO and buffer circuit together with VCS circuit are built to prove the concept. Though the VCS circuit employs no array of diode like standard bandgap circuit, it still employs the concept of proportional to absolute temperature PTAT and a complement to absolute temperature CTAT elements. The integrated VCO, together with VCO core and VCO buffer circuits, are designed for WCDMA application particularly for the demodulator section. All circuits are built in fT45GHz SiGe BiCMOS process.Findings At 760MHz the power consumption for core circuit is 0.6 and 3.3mA for VCO buffer amplifier. The fabricated VCO circuit together with VCO buffer was tested and measured with VCO output of 6dBm at 760MHz with variation of 0.1dBm across 40C to 85C.Originalityvalue A voltage reference circuit which is derived from PTAT and CTAT current generators is presented. The circuit is capable of providing a constant current across absolute temperature or a current PTAT.
Microelectronics International – Emerald Publishing
Published: Jul 25, 2008
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