Pressure sensor circuits
View Patent ↗Implantable pressure sensors and methods for making and using the same are provided. A feature of embodiments of the subject pressure sensors is that they are low-drift sensors. The subject sensors find use in a variety of applications.
1. A method for measuring cardiac pressure, the method comprising:
providing a power supply voltage for a number of control chips over two wires, each control chip coupled to one or more pressure sensors;
transmitting a number of bit sequences carrying address information with the power supply voltage over the two wires;
configuring a pressure sensor for measuring cardiac pressure; and
receiving a digital signal indicating a measured cardiac pressure,
wherein the one or more pressure sensors includes a Wheatstone bridge and wherein the transmitting a number of bit sequences over the two wires involves modulating the power supply voltage with a digital signal.
2. The method of claim 1 , wherein the digital signal is a frequency-shift-keying (FSK) modulated signal.
3. The method of claim 1 , wherein the power supply voltage is provided for approximately 50 μs.
4. A method for measuring cardiac pressure, the method comprising:
providing a power supply voltage for a number of control chips over two wires, each control chip coupled to one or more pressure sensors;
transmitting a number of bit sequences carrying address information with the power supply voltage over the two wires;
configuring a pressure sensor for measuring cardiac pressure; and
receiving a digital signal indicating a measured cardiac pressure,
wherein the one or more pressure sensors includes a Wheatstone bridge, wherein the transmitting a number of bit sequences over the two wires involves modulating the power supply voltage with a digital signal, and wherein the power supply voltage is provided for approximately 50 μs.
5. An integrated circuit for measuring cardiac pressure, the integrated circuit comprising:
a first terminal coupled to a conductor provided in an implanted lead;
a second terminal; and
a control circuit comprising a clock recovery circuit, the control circuit coupled to the first and second terminals wherein, during a first time interval, when digital configuration signals are provided from the controller on the first terminal, the control circuit selectively configures a selected pressure sensor, and wherein, during a second time interval, the control circuit administers electrical signals to the pressure sensor and measures a response voltage from the pressure sensor, and wherein the clock recovery circuit recovers a clock signal from received configuration signals.
6. The integrated circuit of claim 5 , wherein during a third time interval the control circuit communicates a digital signal indicating the measured voltage through the first and second terminals.
7. The integrated circuit of claim 5 , wherein the second terminal is coupled to a conductor provided in the implantable lead.