Pulse or digital communications – Transmitters
Reexamination Certificate
2007-10-09
2007-10-09
Kim, Kevin (Department: 2611)
Pulse or digital communications
Transmitters
Reexamination Certificate
active
10683476
ABSTRACT:
A data converter arranged to enable linear high-efficiency amplification of a signal having a fluctuating envelope. The data converter has a computation circuit, a vector quantizer, and an output terminal. The computation circuit is formed by connecting n (n: a natural number) number of unit circuits each including a vector subtracter having a first input terminal and a second input terminal, and a vector integrator connected to an output side of the vector subtracter. An output at the output terminal and/or an output from each vector integrator are input to the vector subtracter through the second input terminal in the corresponding unit circuit. The vector subtracter outputs data obtained by subtracting a vector input through the second input terminal from a vector input through the first input terminal. The vector quantizer outputs a predetermined value quantized at least with respect to the magnitude of the input vector.
REFERENCES:
patent: 2003/0123566 (2003-07-01), Hasson
Takafumi Yamaji, et al., “A Digital-To-RF Converter Architecture Suitable for a Digial-to RF Direct-Conversion Software Defined Radio Transmitter”, IEICE Trans. Commun. vol. E83-B, No. 6, Jun. 2000, pp. 1254-1260.
B. Razavi, “RF Microelectronics”, Prentice-Hall PTR, 1998 (p. 153, Fig. 5.39).
Adachi Hisashi
Matsuura Toru
Kim Kevin
Matsushita Electric - Industrial Co., Ltd.
Smith , Gambrell & Russell, LLP
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