Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1998-08-14
2000-10-03
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 94, 327337, H03K 500
Patent
active
061278556
ABSTRACT:
An input switch for use in a switch-capacitor circuit having unified architecture, and a switch-capacitor circuit including such an input switch, an amplifier, a capacitor between the amplifier and switch, and at least one NMOS transistor. The input switch samples an input potential in a sampling mode, receives a reference potential, and includes a transmission gate having a first NMOS transistor. The switch is configured to prevent the transmission gate from passing the reference to the capacitor when the reference is so low that the difference between the sampled input and reference is below an overdrive-causing level, thereby preventing capacitor charge loss which would otherwise lead to overdrive while the switch-capacitor circuit compares the reference with the sampled input. When the transmission gate includes a first PMOS transistor connected in parallel with the first NMOS transistor, the switch preferably includes an extra PMOS transistor in series with the first PMOS transistor and the trigger circuitry operates in the comparison mode to prevent the transmission gate from passing the reference to the capacitor when the reference is such that the difference between the sampled input and reference is below the overdrive-causing level.
REFERENCES:
patent: 5463394 (1995-10-01), Sun
patent: 5534819 (1996-07-01), Gunter et al.
patent: 5642059 (1997-06-01), Scoones
Hosotani, S, Miki, Takahiro, Maeda, Atsushi & Yazawa, Nobuharu, "An 8-bit 20-MS/s CMOS A/D Converter with 50-mW Power Consumption," IEEE Journal of Solid State Circuits, vol. 25, No. 1, Feb. 1990, pp. 167-172.
Brandt Brian Paul
Taft Robert Callaghan
Le Dinh T.
National Semiconductor Corporation
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