IMPROVED EXPONENTIAL CURRENT GENERATOR AND METHOD

Title:

IMPROVED EXPONENTIAL CURRENT GENERATOR AND METHOD

Document Type and Number:

Japanese Patent JP2010136377

Kind Code:

A

Abstract:

To generate a current pair in which a ratio is related to a control signal in terms of an index and a function even if Imis smaller than Ibleed.

In an apparatus and method for generating a current pair Ip, Imwhere the ratio of the pair is exponentially related to a control signal, either Ipor Imis larger than a minimum value or smaller than a maximum value. The apparatus includes a feedback correction circuit used to sense the value of Imor Ip. The correction circuit supplies a boost current Iboostwhen the sensed value of Imor Ipis smaller than the minimum value or larger than the maximum value. Iboostis preferably maintained proportional to the difference of the desired value and Ipor Im.

Inventors:

WALKER BRETT CHRISTOPHER
GAZZERO PETER C

Application Number:

JP2009276684A

Publication Date:

June 17, 2010

Filing Date:

December 04, 2009

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Assignee:

QUALCOMM INC

International Classes:

G06G7/24; H03F1/34; H03F3/34; H03F3/45; H03G1/00; H03G3/02

Domestic Patent References:

JPH098559A	1997-01-10
JPH04111506A	1992-04-13
JPS6145612A	1986-03-05
JPH06188640A	1994-07-08

Attorney, Agent or Firm:

Takehiko Suzue
Kurata Masatoshi
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Katsumura Hiro
Shoji Kawai
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takuzo Ichihara
Yamashita Gen

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