Systems and methods for a crystal-less bluetooth low energy transceiver

A method of transmitting and receiving signals comprising:

• receiving a plurality of signals;
• iterating, using a first oscillator, through a set of predetermined frequencies;
• identifying, by a first receiver, a sequence of frequency-hopped packets in response to receiving an incoming signal of the plurality of signals at an expected frequency, wherein the expected frequency is included in the set of predetermined frequencies;
• in response to identifying the sequence of frequency-hopped packets:
• recovering, by a second receiver, a reference signal at a reference frequency from the incoming signal;
• and
• generating and transmitting an enable instruction to a first device;
• in response to the first device receiving the enable instruction:
• transmitting the enable instruction to a second device;
• and
• adjusting, by the first device, a first oscillator frequency of the first oscillator based on the expected frequency of the incoming signal and the reference frequency;
• and
• in response to the second device receiving the enable instruction:
• setting, by the second device, a second oscillator to generate a carrier signal at a predetermined frequency using the reference frequency;
• modulating the carrier signal at the predetermined frequency with transmit data;
• and
• in response to the sequence of frequency-hopped packets elapsing,
• transmitting the modulated carrier signal.

A transceiver comprising:

• a first end receiver configured to receive an incoming signal and detect an advertising event based on the incoming signal;
• a first oscillator configured to generate a signal at a set of predetermined frequencies to detect the advertising event, wherein the first oscillator is configured to iterate through each predetermined frequency of the set of predetermined frequencies, and wherein the set of predetermined frequencies includes a first frequency, a second frequency, and a third frequency,
• wherein the advertising event is detected in response to receiving:
• the incoming signal at the first frequency when the first oscillator is generating the first frequency;
• the incoming signal at the second frequency when the first oscillator is generating the second frequency;
• and
• the incoming signal at the third frequency when the first oscillator is generating the third frequency;
• a receive circuit configured to receive the incoming signal during the advertising event and, in response to the first receiver indicating the advertising event was detected, recover a reference signal at a reference frequency from the incoming signal;
• a first phase lock loop (PLL) interfaced with the first oscillator, the first PLL is configured to:
• lock the first oscillator to the incoming signal using the reference frequency in response to receiving a first enable instruction from the first receiver, wherein the first receiver transmits the first enable instruction to the first PLL in response to detecting the advertising event;
• and
• a transmit circuit including:
• a second oscillator configured to generate a carrier signal;
• a modulator configured to modulate data over the carrier signal at a carrier frequency;
• and
• a second PLL interfaced with the second oscillator, the second PLL is configured to:
• lock the second oscillator to the incoming signal using the reference frequency in response to receiving a second enable instruction from the first PLL, wherein the first PLL transmits the second enable instruction to the second PLL in response to locking the first oscillator,
• wherein the transmit circuit is configured to transmit the modulated carrier signal.