Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1997-02-18
2000-01-25
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327312, 327323, 327 65, 327540, H03K 1901
Patent
active
06018261&
ABSTRACT:
A wideband level shift circuit (200) used with low voltage ECL or CML topologies includes a sub-Vbe voltage reference (201) whose output voltage is offset some fraction of a diode voltage drop below a supply voltage, where the fraction is held at a constant value as the diode voltage varies with temperature. A comparator circuit (203) is attached to the reference voltage circuit (201) as well as to a current sourcing transistor and differential buffer circuit (205). The comparator circuit (203) maintains the DC potential at the output of a current sourcing transistor so that the common-mode DC level of the output signal from a differential buffer is shifted down by a fraction of a diode drop from the common-mode DC level of a wideband AC input signal. The shift circuit (200) offers the advantages of a fraction of a diode DC voltage drop with little loss of AC signal bandwidth for circuits operating from low supply voltages.
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Alford Ronald C.
Martin Frederick L.
Callahan Timothy P.
Motorola Inc.
Scutch, III Frank M.
Shin Eunja
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