Transmitter and wireless communication apparatus using the transmitter
First Claim
Patent Images
1. A transmitter comprising:
- a phase control loop for controlling a phase of a carrier being output from a transmission oscillator; and
an amplitude control loop for controlling an amplitude of a transmission being output signal output from a power amplifier,wherein a filter provided on said amplitude control loop for restricting a frequency band of said amplitude control loop is configured by a first 2nd-order passive filter including a capacitor and a resistor and a second passive filter including only a capacitor, and active current-output circuits are provided at respective front stages of said first 2nd-order passive filter and said second passive filter to isolate the transfer functions of said first 2nd-order passive filter and said second passive filter.
6 Assignments
0 Petitions
Accused Products
Abstract
In a transmitter of polar-loop architecture having a phase control loop and an amplitude control loop, as loop filters for controlling a loop band of the amplitude control loop, a first filter with lag-lead characteristics (secondary or more filter including a capacitor and a resistor) and a second filter of a perfect integrator type (filter including only a capacitor) are employed, and current-output type circuits are connected to respective front stages of the first and second filters.
-
Citations
10 Claims
-
1. A transmitter comprising:
-
a phase control loop for controlling a phase of a carrier being output from a transmission oscillator; and an amplitude control loop for controlling an amplitude of a transmission being output signal output from a power amplifier, wherein a filter provided on said amplitude control loop for restricting a frequency band of said amplitude control loop is configured by a first 2nd-order passive filter including a capacitor and a resistor and a second passive filter including only a capacitor, and active current-output circuits are provided at respective front stages of said first 2nd-order passive filter and said second passive filter to isolate the transfer functions of said first 2nd-order passive filter and said second passive filter. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
-
-
2. A transmitter comprising:
-
a transmission oscillator for generating a carrier; a power amplifier for amplifying a generated carrier signal; a phase control loop which includes a phase detector for comparing a reference signal and a feedback signal and for outputting a signal corresponding to a phase difference thereof, and which controls a phase of the carrier being output from said transmission oscillator; and an amplitude control loop which includes an amplitude detector for comparing a reference signal and a feedback signal and for outputting a signal corresponding to an amplitude difference thereof, and which controls an amplitude of a transmission being output signal output from said power amplifier, wherein a filter provided on said amplitude control loop for restricting a frequency band of said amplitude control loop is configured by a first 2nd-order passive filter with lag-lead characteristics and a second passive filter of a perfect integrator, and active current-output circuits are provided at respective front stages of said first 2nd-order passive filter and said second passive filter to isolate the transfer functions of said first 2nd-order passive filter and said second passive filter.
-
Specification