Power supply modulator circuit for transmitter
AssigneeCrown International, Inc.
InventorHerbert P. Jacobson
Life of this patent
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Abstract
The present invention relates to a power supply modulator for a radio transmitter having apportioned input impedance and buffered switching of power modules. A series arrangement of power supply modules, conventionally disposed in a diode cascade, includes individual inductors to apportion the input impedance of the switching power supplies. The switching sequence of the power supplies is controlled by a FIFO buffer, with the sequentially adjacent power supplies being disposed physically remote so that current transients and thermal loads are more uniformly distributed.
Claims20
A transmitter comprising:
- a plurality of switchable voltage sources, each being switchable to supply an output voltage;
- a plurality of diodes, each of said diodes being connected across a corresponding one of said voltage sources, each said diode being connected in series to form a series connection having output terminals;
- a plurality of inductance means for apportioning the input inductance of said series connection equally among said voltage sources, said plurality of inductance means being operably coupled between adjacent ones of said diodes within said series connection;
- control means for receiving a modulated voltage signal and for switching said voltage sources according to the temporary value of the amplitude of the modulated voltage signal;
- and means for producing an RF signal based on the voltage apparent at said output terminals.
A transmitter comprising:
- means for receiving an input signal;
- a plurality of switchable voltage sources disposed in a series arrangement;
- means for producing an RF signal, said RF producing means being connected to said series arrangement of voltage sources;
- and
- control means for switching said voltage sources according to the input signal, said control means including buffer means for sequencing the switching of said voltage sources according to a predetermined switching sequence responsive to changes in the input signal so that pairs of said voltage sources which are adjacent in said predetermined switching sequence are substantially separately physically disposed in said series arrangement of said voltage sources.
A transmitter comprising:
- means for receiving an input signal;
- a plurality of switchable voltage sources disposed in a series arrangement;
- means for producing an RF signal, said RF producing means being connected to said series arrangement of voltage sources;
- and
- control means for switching said voltage sources according to the input signal, said control means including buffer means for sequencing the switching of said voltage sources according to a predetermined switching sequence responsive to changes in the input signal, said buffer means including a plurality of locations, each said location associated with one of said voltage sources, and said buffer means including an on counter and an off counter referencing the next one of said locations to be switched on and the next one of said locations to be switched off, respectively.
Dependencies are inferred from the claim text.