Transmission arrangement for transmitting data continuously in the time domain
View Patent ↗A transmission arrangement is provided for transmitting data continuously in the time domain. The arrangement includes at least one programmable amplifier in the baseband or in the radio frequency path in the signal processing chain for the signal which is to be transmitted. This programmable amplifier is distinguished in that the signal which actuates the programmable amplifier is a discrete-value signal. By dispensing with complex digital/analog converters, the principle described allows markedly reduced power consumption in transmitters which use code multiple access methods.
1. A transmission arrangement comprising:
a baseband signal processing unit comprising
an in-phase signal path and a quadrature signal path,
a first programmable amplifier comprising a first control input configured to accept a first discrete valued digital gain control signal, the first programmable amplifier comprising an amplifier component arranged in the in-phase signal path and an amplifier component arranged in the quadrature signal path, and
a passive, programmable attenuator comprising a control input configured to accept a second discrete valued digital gain control signal, passive, programmable attenuator comprising an attenuator component arranged in the in-phase signal path and an attenuator component arranged in the quadrature signal path;
a quadrature modulator comprising
a first input coupled to the in-phase signal path,
a second input coupled to the quadrature signal path, and
an output;
a radio frequency path coupled to the output of the quadrature modulator, the radio frequency path comprising a second programmable amplifier configured to accept a third discrete valued digital gain control signal; and
a control unit providing the first, second and third digital gain control signals.
2. The transmission arrangement of claim 1 , wherein the control unit is configured to adjust the first and third discrete digital gain control signals in 1 dB increments, and the control unit is configured to adjust the second digital control signal in 6 dB increments.
3. The transmission arrangement of claim 1 , wherein the baseband signal processing unit processes a useful signal which is to be transmitted.
4. The transmission arrangement of claim 1 , wherein the radio frequency path contains a passive, programmable attenuator.
5. The transmission arrangement of claim 4 , wherein the radio frequency path processes a useful signal which is to be transmitted, the radio frequency path having a control input which is coupled to the control unit in order to provide discrete-value signal attenuation.
6. The transmission arrangement of claim 1 , wherein at least one of the first and/or the second programmable amplifier comprises a plurality of parallel-connected amplifier paths that can be coupled and decoupled independently of one another, the amplifier paths being coupled and decoupled on the basis of the discrete-value control signal.
7. The transmission arrangement of claim 1 , wherein the second programmable amplifier includes a means for setting the rise time of the gain factor.
8. The transmission arrangement of claim 1 , further comprising a feedback path.
9. The transmission arrangement of claim 8 , wherein the feedback path comprises a means for carrier frequency suppression, having an input which is coupled to the output of the quadrature modulator and having an output which is coupled to the in-phase and the quadrature signal path.
10. The transmission arrangement of claim 1 , wherein the transmission arrangement is a mobile radio transmitter.
11. The transmission arrangement of claim 1 , wherein the first and second programmable amplifiers are adjustable in steps of 1 dB.
12. The transmission arrangement of claim 1 , wherein the control unit is coupled to the inputs of the first and second programmable amplifiers by a digital three-conductor bus based on the 3Wire Bus Specification.
13. The transmission arrangement of claim 1 , wherein the quadrature modulator comprises Gilbert multipliers.
14. The transmission arrangement of claim 1 , wherein the passive programmable amplifier comprises a controllable resistor network.
15. A transmitter circuit comprising:
a baseband signal processing circuit comprising
an in-phase signal path and a quadrature signal path,
a first programmable amplifier comprising a first control input configured to accept a first discrete valued digital gain control signal, the first programmable amplifier comprising an amplifier component arranged in the in-phase signal path and an amplifier component arranged in the quadrature signal path, and
a passive, programmable attenuator comprising a control input configured to accept a second discrete valued digital gain control signal, passive, programmable attenuator comprising an attenuator component arranged in the in-phase signal path and an attenuator component arranged in the quadrature signal path;
a quadrature modulator configured to be coupled to an oscillator comprising
a first input coupled to the in-phase signal path,
a second input coupled to the quadrature signal path, and
an output;
a radio frequency circuit coupled to the output of the quadrature modulator, the radio frequency circuit comprising a second programmable amplifier configured to accept a third discrete valued digital gain control signal;
a digital control bus coupled to the first programmable amplifier, the second programmable amplifier and the passive, programmable attenuator;
a control unit coupled to the digital control bus, the control unit configured to provide the first, second and third digital gain control signals via the control bus.
16. The transmitter circuit of claim 15 , wherein the digital control bus comprises a three-conductor bus based on the 3Wire Bus Specification.
17. The transmitter circuit of claim 16 , wherein:
the baseband signal processing circuit is arranged on a first integrated circuit;
the quadrature modulator is arranged on a second integrated circuit; and
the radio frequency circuit is arranged on a third integrated circuit.
18. The transmitter circuit of claim 16 , wherein the transmitter circuit is arranged on at least one integrated circuit.
19. A mobile radio transmitter comprising the transmitter circuit of claim 15 .