公开(公告)号：ZA962952B

公开(公告)日：1996-10-15

申请号：ZA962952

申请日：1996-04-12

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K

IPC: H03G3/30 ,  H04B1/036 ,  H04B1/04 ,  H04B1/40 ,  H03G ,  H04B

Abstract: The process and apparatus of the present invention limits the output power of a radio in response to the temperature of key components of the radio. Temperature sensors (1025) measure the temperature of the components and send the temperature signals to power control circuitry (1030). The transmit power is measured (1020) at the output of the power amplifier (1015). As the temperature increases, the power control circuitry (1030) reduces the transmit power to reduce the temperature of the key components. The power is monitored so that it is not reduced below the power level required by standards.

公开(公告)号：CA2467276A1

公开(公告)日：1996-06-20

申请号：CA2467276

申请日：1995-12-11

Applicant: QUALCOMM INC

Inventor： WEILAND ANA L ,  KORNFELD RICHARD K ,  WHEATLEY CHARLES E III ,  PETERZELL PAUL E

IPC: H04B1/06 ,  H03G1/00 ,  H03G3/30 ,  H04B20060101 ,  H04B1/10 ,  H04B1/16 ,  H04B1/18 ,  H04B1/40 ,  H04B1/7075 ,  H04B1/7097 ,  H04B3/06 ,  H04B7/005 ,  H04B7/26 ,  H04B15/00

Abstract: An apparatus to increase a radio receiver's immunity to radio frequency interference, the radio receiver receiving a signal, the apparatus comprising: a switch (1105) coupled to the received signal, the switch (1105) having an open position and a closed position; a resistance (1101), a first end of the resistance (1101) being coupled to the closed position of the switch (1105) and a second end of the resistance (1101) being coupled to a ground potential; an amplifier (1101) having an input coupled to the open position of the switch (1105), for generating an amplified received signal at an output; a controller coupled to the switch (1105), for switching the switch (1105) to the closed position in response to the received signal exceeding a predetermined power level, said received signal conducting through said switch (1105) and said resistance (1101) to ground potential when said switch (1105) is in said closed position; and said resistance (1101) creating an impedance mismatch at the input to said amplifier (1110) when said switch (1105) is in closed position, thereby reducing the gain contributed by said amplifier (1110).

公开(公告)号：CA2207745A1

公开(公告)日：1996-06-20

申请号：CA2207745

申请日：1995-12-11

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K ,  WEILAND ANA L ,  WHEATLEY CHARLES E III ,  PETERZELL PAUL E

IPC: H04B1/06 ,  H03G1/00 ,  H03G3/30 ,  H04B20060101 ,  H04B1/10 ,  H04B1/16 ,  H04B1/18 ,  H04B1/40 ,  H04B1/7075 ,  H04B1/7097 ,  H04B3/06 ,  H04B7/005 ,  H04B7/26 ,  H04B15/00 ,  H04Q7/32

Abstract: The method and apparatus of the present invention improve the immunity to interference of a radio receiver. The power level of a received signal is detected. If the power level meets or exceeds a predetermined power threshold, the low noise amplifier (703) is by-passed (730), thus increasing the intercept point of the receiver components. Alternative embodiments include the use of an RF power detector (105) to control the front-end gain (110) as a function of jammer power. In lieu of a switchable RF gain block (730), several methods of continuous gain control are proposed. Continuous gain control allows the interference suppression and sensitivity of the receiver to be adjusted at lower signal levels than the switchable gain block. A method of the present invention adjusts the input gain by a predetermined amount (1601). The receiver processing measures the gain change in the IF signal power (1605). If the change is less than the predetermined amount (1610), the CDMA signal and jammers are below the noise floor and, therefore, the gain is increased (1615). If the IF signal power change is greater than the predetermined amount, the interference is evident and the gain is reduced to reduce the intermodulation products (1620). This process is used until the receiver is operating at the best compromise between interference and noise figure.

公开(公告)号：CA2275156A1

公开(公告)日：1995-08-31

申请号：CA2275156

申请日：1995-02-17

Applicant: QUALCOMM INC

Inventor： KERR RICHARD J ,  WILSON NATHANIEL B ,  WEILAND ANA L ,  KORNFELD RICHARD K ,  MALONEY JOHN E

IPC: H04W52/08 ,  H04Q7/32

Abstract: The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specification. This is accomplished by power detection and a correction accumulator that together, generate a gain control signal by limiting the gain adjustment to a maximum value, even when the cell site communicating with the radiotelephone is sending power turn-up commands to the radiotelephone. This process includes dynamically correcting the output level of the transmitter due to gain variations in the transmitter stages or gain control elements.

公开(公告)号：AU6416794A

公开(公告)日：1994-10-24

申请号：AU6416794

申请日：1994-03-25

Applicant: QUALCOMM INC ,  ALPS ELECTRIC CO LTD

Inventor： KORNFELD RICHARD K ,  WEILAND ANA L ,  OKAZAKI MITSUNARI

IPC: H03F1/02 ,  H03F1/30 ,  H03F3/20

Abstract: A control circuit for a multi-stage power amplifier (such as in a portable radio transmitter) compensates for fluctuations in ambient temperature, load, signal level and power supply voltage, The control voltage is set by comparing a biasing level which is related to the amplifier input signal level to a voltage proportional to the power supply current of the last stage of the amplifier. The control voltage resulting from the comparison establishes the operating point of the last stage of the power amplifier.