Radio frequency and microwave module for simultaneously transmitting data and audio signal

• US 6,208,843 B1
• Filed: 06/03/1999
• Issued: 03/27/2001
• Est. Priority Date: 06/03/1999
• Status: Expired due to Fees

• Current Assignee: Cirocomm Technology Corp.
• Original Assignee: Cirocomm Technology Corp.
• Inventors: Huang, Yu-Liang, Chu, Te-Yi, Chu, Der Fen
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): Tran, Congvan
• Application Number:
  US09/324,849
• Time in Patent Office: 663 Days
• Field of Search: 455/76, 455/78, 455/79, 455/86, 455/315, 455/316, 455/318, 455/339, 455/341, 455/260, 455/102, 455/103, 455/113, 455/118, 455/66, 455/67.5, 375/316, 375/324, 375/327, 375/376, 348/2, 348/3, 348/6, 348/14
• US Class Current: 455/76
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes

Abstract

A radio frequency and microwave module for simultaneously transmitting data and audio signal comprises a transmitting unit and a receiving unit. The transmitting unit has two pre-amplifier circuit two voltage-controlled oscillators (VCO), a phase-locked loop (PLL), two low pass filters (LPF) , two amplifiers, a power combiner, a ceramic filter and a transmitting antenna. The receiving unit has a receiving antenna, a ceramic filter, a first low noise amplifier (LNA), a first mixer, an amplifier, a third VCO, a PLL, a low-pass filter, a channel filter, an IF amplifier, a phase shifter, a second mixer, a second low noise amplifier (LNA), a filtering circuit and an operational amplifier. The inventive module can be used for simultaneously transmitting data and audio signal, and the frequency response of the high frequency and low frequency component of the audio signal can be adjusted.

Claims

1. A radio frequency and microwave module for simultaneously transmitting data and audio signal, comprising a transmitting unit and a receiving unit, wherein said transmitting unit having

a first pre-amplifier circuit to pre-amplify the data and audio signal input from a left channel input;

a second pre-amplifier circuit to pre-amplify the data and audio signal input from a right channel input;

a first voltage controlled oscillator VCO connected to the first pre-amplifier circuit and a phase locked loop (PLL), one output of the PLL connected to a first low pass filter, the output of the first low pass filter connected to the first VCO;

the first VCO functioned to modulate the signal input from the first pre-amplifier circuit and send the modulated signal to the PLL, wherein the modulated signal is processed for frequency division and phase comparison with reference to a reference oscillator of the PLL to obtain a stable frequency;

afterward, the resulting signal is transmitted through the low-pass filter to the first VCO for changing the oscillation frequency thereof;

a first amplifier connected to the output of the first VCO to amplifier the output signal thereof;

a second voltage controlled oscillator VCO connected to the second pre-amplifier circuit and a phase locked loop (PLL), one output of the PLL connected to a second low pass filter, the output of the second low pass filter connected to the second VCO;

the second VCO functioned to modulate the signal input from the second pre-amplifier circuit and send the modulated signal to the PLL, wherein the modulated signal is processed for frequency division and phase comparison with reference to a reference oscillator of the PLL to obtain a stable frequency;

afterward, the resulting signal is transmitted through the low-pass filter to the second VCO for changing the oscillation frequency thereof;

a second amplifier connected to the output of the second VCO to amplifier the output signal thereof;

a power combiner connected to the output of the first amplifier and the second amplifier, and the output thereof connected to a ceramic filter, wherein the output of the ceramic filter is transmitted through a transmitting antenna;

the receiving unit comprising

a ceramic filter, the input thereof connected to the receiving antenna and the output thereof connected to a first low noise amplifier (LNA);

the ceramic filter functioned to filter the signal input from the receiving antenna and send the filtered signal to the first low noise amplifier (LNA) for amplifying;

a third VCO, the input thereof connected to a PLL, the output of the PLL connected to a low pass filter, the output of the low pass filter connected to the third VCO, the PLL functioned to divide the output frequency of the third VCO and phase comparison with reference to a reference oscillator of the PLL to obtain a stable frequency;

afterward, the resulting signal is transmitted through the low-pass filter to the third VCO for changing the oscillation frequency thereof;

a first mixer, the input thereof connected to the output of the first low noise amplifier (LNA) and the first mixer connected to an amplifier, the input of the amplifier connected to the third VCO, the first functioned to mix the output of the first low noise amplifier (LNA) and the output of the amplifier and output the mixed signal;

a channel filter, the input thereof connected to the output of the first mixer, the output thereof connected to an IF amplifier, the channel filter functioned to down-convert the frequency the output signal of the first mixer to obtain an IF signal and determine the frequency response and data accessing amount of an audio signal, and the IF signal amplifier by the IF amplifier;

a second mixer, the input thereof connected to the output of the IF amplifier and a phase shifter arranged between the second mixer and the IF amplifier;

the second mixer used to demodulate the signal output by the IF amplifier and 90 degree phase shifted by the phase shifter 41 obtain the data, audio or data and audio signal;

a second low noise amplifier (LNA) connected to the output of the second mixer, the second low noise amplifier (LNA) functioned to amplifier the audio signal output by the second mixer to obtain audio output;

a filtering circuit connected to the second low noise amplifier (LNA) and the output thereof connected to an operational amplifier;

the filtering circuit used to filter the output signal of the second low noise amplifier (LNA) and send the filtered signal to the amplifier for voltage comparison to obtain output data.

2. The radio frequency and microwave module as in claim 1, wherein the channel filter has a first dielectric filter, an IF amplifier and a second dielectric filter.

3. The radio frequency and microwave module as in claim 1, wherein the frequency of the IF signal obtain from the channel filter is 10.7 MHz.