Efficient and fast-switching telemetry transmitter
First Claim
1. A signalling system comprising a transmitter tuned circuit having a capacitor and an inductor therein, means for selectively enabling and disabling said tuned circuit to oscillate, means for pumping said tuned circuit when it is enabled at a frequency which is at least approximately equal to the resonant frequency of said tuned circuit, and means for controlling the disabling of said tuned circuit following a previous enablement when approximately all of the energy stored therein is in the form of voltage across said capacitor and for maintaining and then utilizing the voltage across said capacitor to initially energize the tuned circuit when it is next enabled.
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Accused Products
Abstract
A transmitter for a medical prosthesis which is highly efficient, and also permits rapid starting and stopping so that the same coil can be used for both transmission and reception without undue delays between the two modes of operation. During transmission, a tuned circuit, consisting of the coil and a capacitor, is pumped at a frequency equal to the resonant frequency. Transmission is concluded when almost all of the energy in the tuned circuit is in the form of a voltage across the capacitor and when the current through the inductor is approximately zero. This allows the inductor to be used immediately for reception. At the start of the next transmission cycle, the voltage which is maintained across the capacitor is used to initially energize the tuned circuit.
82 Citations
14 Claims
- 1. A signalling system comprising a transmitter tuned circuit having a capacitor and an inductor therein, means for selectively enabling and disabling said tuned circuit to oscillate, means for pumping said tuned circuit when it is enabled at a frequency which is at least approximately equal to the resonant frequency of said tuned circuit, and means for controlling the disabling of said tuned circuit following a previous enablement when approximately all of the energy stored therein is in the form of voltage across said capacitor and for maintaining and then utilizing the voltage across said capacitor to initially energize the tuned circuit when it is next enabled.
Specification