Voltage controlled oscillator (VCO) with symmetrical output and

Details Voltage controlled oscillator (VCO) with symmetrical output and Voltage controlled oscillator (VCO) with symmetrical output and

1993-12-27

1995-06-20

Grimm, Siegfried H.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

326121, 327 57, 331 34, 331111, 331143, 331177R, 331DIG3, H03K 190948, H03K 30231, G01R 19175

Patent

active

054263840

ABSTRACT:
A voltage controlled oscillator (VCO) (23) includes a periodic signal generator (30) such as a comparator (42)followed by a latch (43), and a logic gate such as a NAND gate (31) connected to the output of the latch (43) to adjust for asymmetries in the output signals from the latch (43). In one embodiment, the NAND gate (31) includes two pullup transistors (80, 81) receiving first and second output signals from the latch and connected between a first power supply voltage terminal and an output node (86). Two switching branches (82, 83 and 84, 85) each including two transistors are connected between the output node (86) and a second power supply voltage terminal. The order of the input signals received by the two transistors is reversed between the two switching branches (82, 83 and 84, 85) to compensate for any duty cycle asymmetries. A frequency divider (32) divides the output of the NAND gate (31) to complete the duty cycle adjustment.

REFERENCES:
patent: 4839537 (1989-06-01), Ueno
patent: 5075581 (1991-12-01), Kamata
patent: 5194831 (1993-03-01), Jackson
Banu; "MOS Oscillators with Multi-Decade Tuning Range and Gigaherz Maximum Speed;" IEEE Journal of Solid-State Circuits, vol. 23, no. 6, pp. 1386-1393, Dec. 1988.

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