Amplifier circuit with wide dynamic range and low power consumpt

Amplifiers – With semiconductor amplifying device – Including push-pull amplifier

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330267, H03F 326

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active

060140577

ABSTRACT:
A novel amplifier circuit having a wide output signal amplitude range and a small current consumption is disclosed. A signal conversion circuit converts the input signal thereof into a first current signal. A current calculation circuit calculates the difference between a predetermined current value and the first current signal. A current amplifier circuit amplifies the difference current. Since the difference current calculated by the current calculation circuit is amplified, the dynamic range of the output can be widened with a small current flowing in the signal conversion circuit and the current calculation circuit. Further, this amplifier circuit, if designed to supply no output current under no load, can reduce the current consumption since the only steady current that flows under that condition is the small one flowing in the signal conversion circuit and the current calculation circuit.

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Holman et al., "Low Voltage Performance of a Low Noise Operational Amplifier in a 1.2 Mum Digital CMOS Technolgy", Proceedings of the 37th Midwest Symposium on Circuits and Systems, vol. 1, Aug. 3-5, 1994, Lafayette, LA USA, XP000531988, pp. 111-114, pp. 112-113; Figure 4.
Anghinolfi et al., "ICON, A Current Mode 5-7 Preamplifier in CMOS Technology for Use With High Rate Particle Detectors" Conference Record of the 1991 IEEE Nuclear Science Symposium and Medical Imaging Conference, vol. 1 of 3, Nov. 2-9, 1991, Santa FE< NM; USA, pp. 629-633, XP000347918, pp. 629-631, Figures 2A-2B.
"CMOS Class-AB Current Mirrors for Precision Current-Mode Analog-Signal-Processing Elements" IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, vol. 43, No. 12, Dec. 1996, pp. 843-845, XP000686178 pp. 843-844, Figures 1,4.

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