Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
1999-10-25
2003-07-08
Trost, William (Department: 2683)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S325000, C455S131000, C455S341000, C455S333000, C455S318000, C455S293000, C455S190100, C455S259000, C327S361000
Reexamination Certificate
active
06591093
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates, in general to circuits and, more particularly, to mixer circuits for providing frequency translation.
BACKGROUND OF THE INVENTION
Conventional dual band cellular phones have two separate receiver circuits for receiving modulated signals at two different carrier frequencies. For example, a conventional dual band cellular phone has first and second receiver circuits for receiving modulated signals having carrier frequencies centered at 900 megahertz (MHz) and 1900 MHz, respectively. Each receiver circuit has its own separate mixer for translating the carrier frequency of the received modulated signal from the Radio Frequency (RF) range to a signal having a frequency in an Intermediate Frequency (IF) range.
Employing two separate mixers for generating IF signals increases the amount of die space needed and increases the power consumption of the cellular phone. As demand moves toward smaller, less expensive phones, this approach of employing two separate mixers is undesirable.
Accordingly, it would be advantageous to have a mixer circuit and method for frequency translating incoming modulated signals in a dual band phone. It would be of further advantage for the mixer circuit to have low power consumption and a minimum number of components.
REFERENCES:
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Coffing Danielle L.
Durec Jeffrey C.
Motorola Inc.
Perez-Gutierrez Rafael
Trost William
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