Branislav Petrovic, 731014 Poplar Dr, Falls Church, VA 22046

6538532, Mar 25, 2003

Apr 10, 2001

09/829572

Branislav Petrovic - La Jolla CA

Broadband Innovations, Inc. - San Diego CA

H03H 709

333177, 333185

A series tuned resonator circuit topology permits implementation of narrow band-pass filters having higher loaded quality factors (Q ) and lower insertion loss than was previously achievable in the prior art employing such a topology. The topology employs an additional parallel capacitor for the series-tuned topology, with very low C/L ratios to achieve the combination of higher values of Q , low insertion loss and a steeper roll-off between the pass-band and the stop-band (at both lower and higher frequencies). Air coils are used to achieve the large inductor values desirable for the series-tuned topology.

6580330, Jun 17, 2003

Sep 19, 2000

09/665559

Ron D. Katznelson - San Diego CA
Branislav A. Petrovic - La Jolla CA

Broadband Innovations, Inc. - San Diego CA

H03L 724

331 44, 331177 R, 331177 V, 455316, 455318

An apparatus for centering the frequency of an injection locked oscillator (ILO) measures the difference of the phase (or a parameter related to the phase) between ILO output signals in response to alternate high level and low level RF drive signals, and can tune the center frequency of the ILO in accordance with the measurements to minimize the phase difference.

6847255, Jan 25, 2005

Jun 1, 2001

09/872143

Branislav A. Petrovic - La Jolla CA, US
Maxim Ashkenasi - La Jolla CA, US

Broadband Innovations, Inc. - San Diego CA

H03D 300
H03D 1300
H03L 7087

329323, 329302, 327 3, 327 12, 327 40, 327 43, 331 25

A frequency discriminators (FD) and frequency modulation (FM) demodulators, utilizing single sideband (SSB) complex conversion directly to zero IF, suitable for direct demodulation at high frequencies of analog FM or digital FSK modulated signals, as well as for high speed frequency discrimination (or frequency comparison) in applications such as frequency acquisition in frequency synthesizers. The complex SSB down-converter consists of a quad of mixers and quadrature splitters in both the signal path and local oscillator (LO) path. Each mixer receives both the signal and the LO, each either in-phase or quadrature. The outputs of mixers are combined in pairs, to produce the SSB in-phase (I) baseband signal and the SSB quadrature (Q) baseband signal. Both I and Q signals are then delayed, each multiplied by un-delayed version of the other one. The multiplication products are summed together, to produce an FD error signal, or an FM demodulated signal at the output.

6977556, Dec 20, 2005

May 25, 2000

09/580513

Branislav Petrovic - La Jolla CA, US
Max Ashkenasi - La Jolla CA, US

Broadband Innovations, Inc. - San Diego CA

H03L007/00

331 18, 331 1 A, 331 16

A single loop PLL frequency synthesizer for operation in the MHz to GHz range, suitable for integration in integrated circuits, operates at high comparison frequencies thus achieving superior phase noise performance, having wide loop bandwidths while able to tune in small frequency steps. It is based on the fact that the output frequency and the reference clock frequency always have a rational relationship, and so can always be represented as a ratio of two integer numbers. This ratio is expanded into various expressions of equivalent fraction expansions taking the form of a series of divided, added or subtracted terms, each being a rational number in itself. This ratio is realized in hardware through stages of frequency conversions using single sideband mixers (either the upper or lower sideband, and frequency dividers. This process of frequency translation thus generates the comparison frequency to which the PLL phase-locks the VCO.

6982592, Jan 3, 2006

Dec 7, 2004

11/004992

Branislav A. Petrovic - La Jolla CA, US
Maxim Ashkenasi - La Jolla CA, US

Broadband Innovations, Inc. - San Diego CA

H03D 3/00
H03D 13/00
H03L 7/087

329323, 329302, 327 3, 327 12, 327 40, 327 43, 331 25

A frequency discriminators (FD) and frequency modulation (FM) demodulators, utilizing single sideband (SSB) complex conversion directly to zero IF, suitable for direct demodulation at high frequencies of analog FM or digital FSK modulated signals, as well as for high speed frequency discrimination (or frequency comparison) in applications such as frequency acquisition in frequency synthesizers. The complex SSB down-converter consists of a quad of mixers and quadrature splitters in both the signal path and local oscillator (LO) path. Each mixer receives both the signal and the LO, each either in-phase or quadrature. The outputs of mixers are combined in pairs, to produce the SSB in-phase (I) baseband signal and the SSB quadrature (Q) baseband signal. Both I and Q signals are then delayed, each multiplied by un-delayed version of the other one. The multiplication products are summed together, to produce an FD error signal, or an FM demodulated signal at the output.

7003275, Feb 21, 2006

May 18, 2000

09/574707

Branislav Petrovic - La Jolla CA, US

Broadband Innovations, Inc. - San Diego CA

H04B 1/26

455323, 4551272, 4551143, 455118

Agile frequency converter and method, IF-RF level exchange process, and notch filtering techniques. System noise and spurious levels generated by channel frequency conversion is reduced in applications requiring broadband combining of frequency converters to form multichannel composite signal. Converter employs two-stage frequency conversion process, with gain exchange system using variable pre-mixer gain and variable post-mixer attenuation to maintain constant RF output signal power level. For those few conversion frequencies where distortion component(s) cannot be filtered without degrading desired signal, IF-RF level exchange is optimized for meeting the carrier-to-distortion (C/D) ratio specifications at slight expense of noise level for that channel only, while still meeting aggregate combined carrier-to-noise (C/N) specification requirements. Optimal apportionment of level exchange for each channel depends on specific frequency rejection capability of spurious components and is matched to filtering capability and stored within non-volatile memory of a microcontroller used in the frequency converter.

7005919, Feb 28, 2006

Jun 26, 2003

10/518577

Branislav Petrovic - La Jolla CA, US
Cong Nguyen - San Diego CA, US

Broadband Innovations, Inc. - San Diego CA

H03F 1/26

330149, 330124 R

A method for improving or eliminating second harmonic and higher even order distortion terms and balance of fundamental signals in push-pull amplifiers and other differential circuits is disclosed. A common-mode (CM) signal is generated as a sum of two complementary (out of phase) signals in a summation network. The CM signal contains even order distortion terms only, while the fundamental signal and odd order distortion terms are canceled, thus providing a correction signal that can be used to reduce even order distortion terms, by injecting the correction signal, with proper phase and amplitude, into suitable circuit nodes. For feedback, the correction signal is injected at the input of the amplifiers, for feed-forward, it's injected at the output. The correction signal can be amplified to higher levels and injected into the circuit, without affecting gain of fundamental signals; and can result in significant even order distortion improvements, and improved balance of complementary fundamental signals.

7061317, Jun 13, 2006

Aug 5, 2005

11/197318

Branislav Petrovic - La Jolla CA, US
Cong Nguyen - San Diego CA, US

General Instrument Corporation - Horsham PA

H03F 1/26

330149, 330124 R

A method for improving or eliminating second harmonic and higher even order distortion terms and balance of fundamental signals in push-pull amplifiers and other differential circuits is disclosed. A common-mode (CM) signal is generated as a sum of two complementary (out of phase) signals in a summation network. The CM signal contains even order distortion terms only, while the fundamental signal and odd order distortion terms are canceled, thus providing a correction signal that can be used to reduce even order distortion terms, by injecting the correction signal, with proper phase and amplitude, into suitable circuit nodes. For feedback, the correction signal is injected at the input of the amplifiers, for feed-forward, it's injected at the output. The correction signal can be amplified to higher levels and injected into the circuit, without affecting gain of fundamental signals; and can result in significant even order distortion improvements, and improved balance of complementary fundamental signals.