Systems and methods for reducing noise in mixed-mode integrated circuits

A method for reducing switching noise of a semiconductor integrated circuit having analog and digital components on the same substrate including a cross-coupled flip-flop circuit including at least two group of transistors in a quiescent state with a first group of transistors in a first logic state and a second group of transistors in a second logic state, comprising:

• pulsing address lines coupled to each group of transistors with clock pulses which turns on gating devices and flows voltage to a one bit line such that a cell of the integrated circuit can be read;
• charging a micro-battery coupled at one end to the group of transistors;
• transitioning the first group of transistors from the first logic state to the second logic state by pulsing the address lines and grounding the one bit line associated with a second group of transistors, causing a zero bit line to transition from a low logic state to ground thereby turning on the second group of transistors and turning off the first group of transistors by pulling the first group of transistors to ground;
• during the period when both the first group of transistors and the second group of transistors are turned on and a high current exists causing a voltage spike pulling current from the charged micro-battery;
• and
• limiting current flow by use of a resistor coupled at one end to one end of the battery and to the voltage source at another end of the resistor.

A system for reducing noise in a mixed-mode integrated circuit, comprising:

• a first transistor network in a first logic state;
• a second transistor network in a second logic state;
• a thin film battery coupled to both the first transistor network and the second transistor network;
• a first gating network coupled to the first transistor network;
• a second gating network coupled to the second transistor network;
• address lines coupled to the first and second gating networks for activating read and write operations thereby enabling the transition of the logic states of the first and second transistor networks;
• and
• a resistor coupled at one end to the thin film battery and to a voltage source at the other end, the resistor adapted to isolate the voltage source and limit the current drawn from the thin film battery wherein during a transition of logic states by the first and second transistors and current surges during the period when both the first and second transition network are turned on causing a spike in voltage, current demand is met by the thin film battery that gradually recharges eliminating voltage spikes traversing the mixed-mode integrated circuit.

A system for reducing noise in a mixed-mode integrated circuit, the integrated circuit including at least one inverter having at least one logic state, the system comprising:

• a current source emitting from the inverter that surges during a transition in logic state;
• a micro-battery coupled to the inverter and adapted to absorb the current source;
• and
• a resistor coupled to the micro-battery and a power source for limiting the current drawn from the micro-battery.