P-bit generator and methods for tuning a p-bit generator having decoupled stochastic and control paths

A random number generator, comprising:

• a stochastic device configured with a first electrical terminal, a second electrical terminal and a probabilistic bit (p-bit) output terminal, wherein each stochastic device is configured to generate p-bits at the p-bit output terminal which randomly oscillate between a parallel resistance state RP and an anti-parallel resistance state RAP in response to thermal noise;
• a positive DC voltage VDD connected to the first electrical terminal of the stochastic device;
• a negative DC voltage VSS connected to the second electrical terminal of the stochastic device;
• and
• an activation unit including a first input terminal, a second input terminal, an activation unit output terminal, wherein the first input terminal is connected to the p-bit output terminal and the second input terminal is connected to a control unit, wherein the activation unit is configured to generate a voltage output signal Vout based on the resistance state of each p-bit upon receiving an input signal from the control unit.

A method of implementing a tunable probabilistic bit (p-bit) voltage divider, comprising:

• connecting a first stochastic magnetic tunnel junction device to a second stochastic magnetic tunnel junction device,
• connecting a positive DC voltage VDD to the first electrical terminal of the first stochastic magnetic tunnel junction device;
• connecting a negative DC voltage VSS connected to the second electrical terminal of the second stochastic magnetic tunnel junction device, wherein each stochastic magnetic tunnel junction device is configured to generate p-bits which randomly oscillate between a first resistance state and a second resistance state in response to thermal noise;
• generating, at a p-bit output terminal comprising the second electrical terminal of the first stochastic magnetic tunnel junction device and the first electrical terminal of the second stochastic magnetic tunnel junction device, p-bit output signals;
• connecting an inverting terminal of a comparator to the p-bit output terminal;
• connecting a non-inverting terminal of the comparator to a variable voltage VIN;
• increasing a voltage of the variable voltage VIN until the variable voltage VIN is equal to a voltage received at the inverting terminal based on the p-bit output signals;
• and
• generating a voltage Vout at the voltage output terminal given by:
• V
• out
• =
• (
• V
• DD
• ·
• R
• MTJB
• +
• V
• SS
• ·
• R
• MTJT
• )
• /
• (
• R
• MTJB
• +
• ⁢
• R
• MTJT
• )
• ,
• where RMTJB is a resistance of the first stochastic magnetic tunnel junction device and RMTJT is a resistance of the second stochastic magnetic tunnel junction device.