1. Configuration for carrying out a current-to-voltage conversion, preferably for an infrared receiver, comprising a multistage transimpedance stage, which has two inputs with preceding first coupling capacitances and two outputs; the outputs of the transimpedance stage being connected to inputs of a configuration for gain control; and an output of the configuration for gain control being connected to a gain control input of the transimpedance stage; the outputs of the transimpedance stage being connected to an associated input of a downstream comparator, and outputs of a second stage are fed back to inputs of a first stage of the multistage transimpedance stage.
2. Configuration, as claimed in claim 1, wherein the outputs of the multistage transimpedance stage are connected directly to the inputs of the downstream comparator.
3. Configuration, as claimed in claim 1, wherein a stage, which limits an output signal to a threshold value, is arranged between the outputs of the transimpedance stage.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A wireless communication terminal, comprising
a transmitter enabled to transmit during transmission periods and disabled outside said transmission periods,
a flashlight unit,
a power supply supplying a voltage for said transmitter and said flashlight, and
a controller disabling said supply of voltage to said flashlight unit during transmitting periods of said transmitter.
2. A wireless terminal according to claim 1, wherein said transmitter is enabled to transmit in one or some of TDMA time slots of a TDMA frame, and said controller disables said supply of voltage during said one or some of TDMA time slots.
3. A wireless terminal according to claim 1, wherein an RF power amplifier of said transmitter is turned on when said transmitter is enabled, and turned of when said transmitter is disabled.
4. A wireless terminal according to claim 1, wherein said power supply comprises a rechargeable battery.
5. A wireless terminal according to claim 1, wherein the terminal comprises a digital camera, and wherein a total exposure time for a camera picture creation is dependent on the time needed for transmission during the picture creation.
6. A circuit for controlling a wireless communication terminal having a transmitter enabled to transmit during transmission periods and disabled outside said transmission periods, a flashlight unit, and a power supply supplying a voltage for said transmitter and said flashlight, said circuit comprising a control logic disabling said supply of voltage to said flashlight unit during transmitting periods of said transmitter.
7. A circuit according to claim 6, wherein said transmitter is enabled to transmit in one or some of TDMA time slots of a TDMA frame, and said controller disables said supply of voltage during said one or some of TDMA time slots.
8. A circuit according to claim 6, wherein a total exposure time for a picture creation is dependent on the time needed for transmission during the picture creation by a digital camera provided in the terminal.
9. A circuit according to claim 6, wherein said circuit is realized by means of an integrated circuit chip.
10. A circuit according to claim 6, wherein said control logic comprises an executable program.
11. A method for controlling a wireless communication terminal having a transmitter turned on during transmission periods and turned off outside said transmission periods, a flashlight unit, and a power supply supplying a voltage for said transmitter and said flashlight, said method comprising driving said transmitter with said supply voltage at a first priority and enabling driving said flashlight unit with said supply voltage only outside said transmitting periods of said transmitter.
12. A method according to claim 11, comprising enabling said transmitter to transmit in one or some of TDMA time slots of a TDMA frame, and disabling said supply of voltage to the flashlight unit during said one or some of TDMA time slots.
13. A method according to claim 11, wherein the terminal comprises a digital camera, and said method further comprises controlling a total exposure time for a camera picture creation based on the transmission period or periods occurring during the picture creation.
14. A wireless communication terminal, comprising
a transmitter,
a transmitter control unit generating a transmitter control signal turning the transmitter on during transmission periods and turning the transmitter off outside said transmission periods,
a flashlight unit,
a power supply for said transmitter and said flashlight,
a flash control unit generating a flash control signal,
a flash driver unit turning the flashlight unit on in response to said flash control signal,
logical circuitry responsive to said transmitter control signal for allowing said flash control signal to enable said flashlight driver unit only outside said transmission periods.
15. A wireless communication terminal according to claim 14, wherein the terminal comprises a digital camera, and wherein the flash control circuit controls a total exposure time for a camera picture creation based on the transmission periods occurring during the picture creation.
16. A wireless terminal according to claim 14, wherein at least one of said transmission control signal and said flash control signal is in form of digital information.