| 主权项 |
1. A transmission device comprising:
a signal source operable to generate a command signal and a source signal; a voltage supply circuit including an alternating current generating portion and a full rectifying portion, said voltage supply circuit being operable to generate an envelope tracking voltage based on the command signal; a transmitting portion operable to transmit a signal based on the source signal and the envelope tracking voltage; wherein said alternating current generating portion is to receive the command signal and includes a first input transistor, a second input transistor and a primary winding, wherein said first input transistor and said second input transistor are operable to generate a primary alternating current through said primary winding based on the command signal; wherein said full rectifying portion includes a multiple tapped secondary winding and a voltage doubler having a first transistor, a second transistor, a first capacitor and a second capacitor, wherein said multiple tapped secondary winding is operable to generate a secondary alternating current based on the primary alternating current, wherein said first transistor is operable to conduct a first current in a first direction to the first capacitor based on a positive portion of the secondary alternating current, wherein said first capacitor is operable to store a first charge based on the first current, wherein said second transistor is operable to conduct a second current in a second direction to said second capacitor based on a negative portion of the secondary alternating current, and wherein said second capacitor is operable to store a second charge based on the second current; wherein said voltage supply circuit further comprises a baseline voltage generating portion operable to generate a baseline voltage and including a second secondary winding and a full-wave rectification circuit having a first rectifier transistor, a second rectifier transistor and a baseline capacitor, wherein said second secondary winding is operable to generate a baseline alternating current based on the primary alternating current, wherein said first rectifier transistor is operable to conduct a first baseline current in the first direction charging said baseline capacitor based on a positive portion of the baseline alternating current, wherein said second rectifier transistor is operable to conduct a second baseline current in the second direction charging said baseline capacitor based on a negative portion of the baseline alternating current, wherein said baseline capacitor is operable to store a baseline charge based on the first baseline current and the second baseline current, and wherein a baseline voltage is generated in the baseline capacitor; wherein said baseline capacitor is coupled to the first and second capacitors to charge during both positive and negative directions for voltage balancing the first and second capacitors, wherein said first capacitor, said second capacitor, said third baseline capacitor are connected in series to form a capacitor string and to provide a stepped output voltage; further comprising a switch bank including a plurality of bidirectional switches, wherein said switch bank is operable to generate an output based on a voltage of said first capacitor, a voltage of said second capacitor, a voltage of said baseline capacitor, or a combination thereof, the bidirectional switches allowing current to flow back to the voltage supply circuit when voltage at the output is to be reduced, and wherein said plurality of bidirectional switches are connected to have a common ground. |
