Title :
A highly accurate BiCMOS cascode current mirror for wide output voltage range
Author :
Yang, Byung Do ; Kim, Jang Su ; Yun, Jin Kuk ; Lee, Yong Kyu ; Lee, Jee Sue
Author_Institution :
VLSI Circuit & Syst. Lab., Chungbuk Nat. Univ., Cheongju
Abstract :
In this paper, a highly accurate wide swing BiCMOS cascode current mirror is proposed. It uses the base-current compensated BJT current mirror. It increases both output impedance and output voltage range by using the npn-NMOS cascode instead of the NMOS-NMOS cascode. The npn transistor copies the input current and the NMOS transistor increases the output impedance for the accurate current mirroring. The proposed current mirror achieves highly constant current for wide output voltage range. Simulation results were verified with measurements performed on a fabricated chip using a 5/16 V 0.5 um BCD process. It has only -2.5~1.0% current error for 0.3~16 V output voltage range.
Keywords :
BiCMOS analogue integrated circuits; bipolar transistors; current mirrors; electric impedance; low-power electronics; BiCMOS cascode current mirror; base-current compensated BJT current mirror; npn-NMOS cascode; output impedance; wide output voltage range; Analog integrated circuits; BiCMOS integrated circuits; Current supplies; Impedance; MOSFETs; Mirrors; Performance evaluation; Semiconductor device measurement; Very large scale integration; Voltage control;
Conference_Titel :
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-1683-7
Electronic_ISBN :
978-1-4244-1684-4
DOI :
10.1109/ISCAS.2008.4541917
