Abstract:
A transmitting method and a transmitter apparatus, which need no manual adjustment, are disclosed. A delay amount of a delay means is automatically adjusted such that an out-of-band distortion component of a transmission signal is minimized, and a correct timing is produced by the method and the apparatus. In this transmitter apparatus, a first delay means adjusts a control timing over a voltage that controls a power amplifying means, and a distributor distributes an output from the power amplifying means in order to feedback parts of the output. A distortion adjusting means calculates a distortion component of the transmission signal by using the signal fed back by the distributor, and adjusts automatically a delay amount of the first delay means so as to minimize the distortion component. This structure allows eliminating manual adjustment, and obtaining high power-efficiency with fewer distortions.
Abstract:
A low noise amplifier circuit (10) includes an attenuator (12) for receiving a calibration signal and generating an attenuated calibration signal. A low noise amplifier (14) amplifies the attenuated calibration signal in calibration mode or amplifies a functional signal in functional mode. In calibration mode, a envelope detector/comparator (16) compares the calibration signal with the output of the low noise amplifier and generates a compensation signal indicating a deviation between the two signals. The gain of the low noise amplifier is adjusted responsive to the compensation signal.
Abstract:
PROBLEM TO BE SOLVED: To lessen the influence of DC noise due to the AGC gain update in a direct conversion receiver. SOLUTION: As shown with AGC gain update timings t1-t4, etc. in the slot structure of received signals, the timing is shifted every time to disperse and lessen the influence of the DC noise peculiar to the direct conversion accompanying with the AGC gain update. If, especially, the slots of received signals have information (Data) with a high code correcting power and information (TPC, TFCI, PILOT) with a low code correcting power, the AGC gain update timing is shifted in the former information part to generate it, thereby more lessening the influence of the noise. The shift width of the AGC gain update timing is set to be greater than one symbol width of the received signal, thereby further lessening the influence of the noise due to the AGC gain update. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a highly efficient transmitter capable of covering an output level in a wide range. SOLUTION: The operation mode of a high frequency power amplifier 15 is designated to one between a linear operation mode and a saturation operation mode on the basis of an operation mode designation signal 107. The gain of a variable gain amplifier 14 provided at the preceding stage of the high frequency power amplifier 15 and the values of output voltage 109 and bias current supplied to the high frequency power amplifier 15 from a power voltage/bias current control circuit 17 are changed. In the case of the saturation operation mode, the gain of the variable gain amplifier 14 is configured so as to be always larger by a prescribed amount than in the case of the linear operation mode. This makes the high frequency power amplifier 15 operate in a designated operation mode to secure an output transmission power range widely. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To enable preventing distortion of a waveform by applying a sufficient idle current to a transistor for amplification in the vicinity of the maximum level of an output power, and to enable improving power efficiency in a region where the output power is low, in a high-frequency power amplifier circuit for giving a bias to the transistor for amplification by a current mirror system. SOLUTION: A detection circuit (240) is provided which consists of a detection transistor (Q1) having a control terminal receiving the AC component of the input signal of the amplification transistor (213) of the final stage, current mirror circuits (Q2, Q3) for transferring a current flowing to the transistor, and a current-voltage converting means (Q4) for converting a current of the transfer side of the current mirror circuits into a voltage. A voltage from a bias circuit (230) for generating the bias voltage of the amplification transistor is applied to the control terminal of the detection transistor of the detection circuit, and the output of the detection circuit is applied to the control terminal of the amplification transistor of the final stage. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To further reduce power consumption at the time of a small signal output. SOLUTION: When a radio signal is transmitted to a small cell according to an amplifying operation mode designated by a main controller 10 in an amplifying control circuit 120, a feeding control circuit 121 is controlled to stop feeding to a main amplifier 101 and to feed to an error amplifier 110 in stead of the main amplifier 101. Also, switchover switches 112 and 113 are controlled to switch a movable point to a fixed point "b" side. Thus, the radio signal amplified by the error amplifier 110 is transmitted as the radio signal of power corresponding to the small cell. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
A transmitting method and a transmitter apparatus wherein no manual adjustments are required, the delay amount of delay means is automatically so adjusted as to minimize distortion components outside the band of signals to be transmitted, and wherein correct timing is realized. In this transmitter apparatus, first delay means adjusts the control timing of a voltage that controls power-amplifying means. A distributor feeds back a part of an output from the power-amplifying means. Distortion-adjusting means uses a signal fed back by the distributor to calculate the distortion components of a transmitted signal, and automatically so adjusts the delay amount of the first delay means as to minimize the distortion components. This eliminates the necessity of manual adjustments, reduces the distortion, and provides a high efficiency of power supply.